diff --git a/.eslintignore b/.eslintignore
index 564cfdfb14d2a..5e4165322a118 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -4,6 +4,7 @@ shells/browser/chrome/build
 shells/browser/firefox/build
 shells/browser/shared/build
 shells/dev/dist
+packages/react-devtools-core/dist
 vendor
 *.js.snap
 
diff --git a/package.json b/package.json
index 18c5527081a3d..f5dd64b0dee18 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
     "test:chrome": "node ./shells/browser/chrome/test",
     "test:firefox": "node ./shells/browser/firefox/test",
     "test:standalone": "cd packages/react-devtools && yarn start",
-    "typecheck": "flow check"
+    "typecheck": "flow check --show-all-errors"
   },
   "devEngines": {
     "node": "10.x || 11.x"
@@ -119,7 +119,7 @@
     "fbjs": "0.5.1",
     "fbjs-scripts": "0.7.0",
     "firefox-profile": "^1.0.2",
-    "flow-bin": "^0.97.0",
+    "flow-bin": "^0.103.0",
     "fs-extra": "^3.0.1",
     "gh-pages": "^1.0.0",
     "html2canvas": "^1.0.0-alpha.12",
diff --git a/packages/react-devtools-core/src/backend.js b/packages/react-devtools-core/src/backend.js
index f76659180aa56..11a5dde7c96cf 100644
--- a/packages/react-devtools-core/src/backend.js
+++ b/packages/react-devtools-core/src/backend.js
@@ -8,6 +8,7 @@ import { __DEBUG__ } from 'src/constants';
 import setupNativeStyleEditor from 'src/backend/NativeStyleEditor/setupNativeStyleEditor';
 import { getDefaultComponentFilters } from 'src/utils';
 
+import type { BackendBridge } from 'src/bridge';
 import type { ComponentFilter } from 'src/types';
 import type { DevToolsHook } from 'src/backend/types';
 import type { ResolveNativeStyle } from 'src/backend/NativeStyleEditor/setupNativeStyleEditor';
@@ -64,7 +65,7 @@ export function connectToDevTools(options: ?ConnectOptions) {
     return;
   }
 
-  let bridge: Bridge | null = null;
+  let bridge: BackendBridge | null = null;
 
   const messageListeners = [];
   const uri = 'ws://' + host + ':' + port;
diff --git a/packages/react-devtools-core/src/standalone.js b/packages/react-devtools-core/src/standalone.js
index 7bd636b80e448..b9fc4ff25a805 100644
--- a/packages/react-devtools-core/src/standalone.js
+++ b/packages/react-devtools-core/src/standalone.js
@@ -17,6 +17,7 @@ import DevTools from 'src/devtools/views/DevTools';
 import launchEditor from './launchEditor';
 import { __DEBUG__ } from 'src/constants';
 
+import type { FrontendBridge } from 'src/bridge';
 import type { InspectedElement } from 'src/devtools/views/Components/types';
 
 installHook(window);
@@ -46,7 +47,7 @@ function setStatusListener(value: StatusListener) {
   return DevtoolsUI;
 }
 
-let bridge: Bridge | null = null;
+let bridge: FrontendBridge | null = null;
 let store: Store | null = null;
 let root = null;
 
@@ -83,7 +84,7 @@ function reload() {
     root = createRoot(node);
     root.render(
       createElement(DevTools, {
-        bridge: ((bridge: any): Bridge),
+        bridge: ((bridge: any): FrontendBridge),
         showTabBar: true,
         store: ((store: any): Store),
         warnIfLegacyBackendDetected: true,
@@ -166,7 +167,7 @@ function initialize(socket: WebSocket) {
       }
     },
   });
-  ((bridge: any): Bridge).addListener('shutdown', () => {
+  ((bridge: any): FrontendBridge).addListener('shutdown', () => {
     socket.close();
   });
 
diff --git a/shells/dev/app/SuspenseTree/index.js b/shells/dev/app/SuspenseTree/index.js
index e9a1fef4d2b5b..873f210e163d8 100644
--- a/shells/dev/app/SuspenseTree/index.js
+++ b/shells/dev/app/SuspenseTree/index.js
@@ -1,17 +1,17 @@
 // @flow
 
-import React, { Suspense, useState } from 'react';
+import React, { Fragment, Suspense, useState } from 'react';
 
 function SuspenseTree() {
   return (
-    <>
+    <Fragment>
       <h1>Suspense</h1>
       <h4>Primary to Fallback Cycle</h4>
       <PrimaryFallbackTest initialSuspend={false} />
       <h4>Fallback to Primary Cycle</h4>
       <PrimaryFallbackTest initialSuspend={true} />
       <NestedSuspenseTest />
-    </>
+    </Fragment>
   );
 }
 
@@ -20,7 +20,7 @@ function PrimaryFallbackTest({ initialSuspend }) {
   const fallbackStep = useTestSequence('fallback', Fallback1, Fallback2);
   const primaryStep = useTestSequence('primary', Primary1, Primary2);
   return (
-    <>
+    <Fragment>
       <label>
         <input
           checked={suspend}
@@ -33,7 +33,7 @@ function PrimaryFallbackTest({ initialSuspend }) {
       <Suspense fallback={fallbackStep}>
         {suspend ? <Never /> : primaryStep}
       </Suspense>
-    </>
+    </Fragment>
   );
 }
 
@@ -45,32 +45,32 @@ function useTestSequence(label, T1, T2) {
     </button>
   );
   let allSteps = [
-    <>{next}</>,
-    <>
+    <Fragment>{next}</Fragment>,
+    <Fragment>
       {next} <T1 prop={step}>mount</T1>
-    </>,
-    <>
+    </Fragment>,
+    <Fragment>
       {next} <T1 prop={step}>update</T1>
-    </>,
-    <>
+    </Fragment>,
+    <Fragment>
       {next} <T2 prop={step}>several</T2> <T1 prop={step}>different</T1>{' '}
       <T2 prop={step}>children</T2>
-    </>,
-    <>
+    </Fragment>,
+    <Fragment>
       {next} <T2 prop={step}>goodbye</T2>
-    </>,
+    </Fragment>,
   ];
   return allSteps[step];
 }
 
 function NestedSuspenseTest() {
   return (
-    <>
+    <Fragment>
       <h3>Nested Suspense</h3>
       <Suspense fallback={<Fallback1>Loading outer</Fallback1>}>
         <Parent />
       </Suspense>
-    </>
+    </Fragment>
   );
 }
 
@@ -118,19 +118,19 @@ function Never() {
   throw new Promise(resolve => {});
 }
 
-function Fallback1({ prop, ...rest }) {
+function Fallback1({ prop, ...rest }: any) {
   return <span {...rest} />;
 }
 
-function Fallback2({ prop, ...rest }) {
+function Fallback2({ prop, ...rest }: any) {
   return <span {...rest} />;
 }
 
-function Primary1({ prop, ...rest }) {
+function Primary1({ prop, ...rest }: any) {
   return <span {...rest} />;
 }
 
-function Primary2({ prop, ...rest }) {
+function Primary2({ prop, ...rest }: any) {
   return <span {...rest} />;
 }
 
diff --git a/src/__tests__/bridge-test.js b/src/__tests__/bridge-test.js
index 1a9b4b949a5cf..fe89a6c2b10f9 100644
--- a/src/__tests__/bridge-test.js
+++ b/src/__tests__/bridge-test.js
@@ -15,9 +15,9 @@ describe('Bridge', () => {
     const bridge = new Bridge(wall);
 
     // Check that we're wired up correctly.
-    bridge.send('init');
+    bridge.send('reloadAppForProfiling');
     jest.runAllTimers();
-    expect(wall.send).toHaveBeenCalledWith('init', undefined, undefined);
+    expect(wall.send).toHaveBeenCalledWith('reloadAppForProfiling');
 
     // Should flush pending messages and then shut down.
     wall.send.mockClear();
@@ -25,9 +25,9 @@ describe('Bridge', () => {
     bridge.send('update', '2');
     bridge.shutdown();
     jest.runAllTimers();
-    expect(wall.send).toHaveBeenCalledWith('update', '1', undefined);
-    expect(wall.send).toHaveBeenCalledWith('update', '2', undefined);
-    expect(wall.send).toHaveBeenCalledWith('shutdown', undefined, undefined);
+    expect(wall.send).toHaveBeenCalledWith('update', '1');
+    expect(wall.send).toHaveBeenCalledWith('update', '2');
+    expect(wall.send).toHaveBeenCalledWith('shutdown');
 
     // Verify that the Bridge doesn't send messages after shutdown.
     spyOn(console, 'warn');
diff --git a/src/__tests__/inspectedElementContext-test.js b/src/__tests__/inspectedElementContext-test.js
index 2fdbfe95e8904..2cf1ed8632975 100644
--- a/src/__tests__/inspectedElementContext-test.js
+++ b/src/__tests__/inspectedElementContext-test.js
@@ -2,14 +2,14 @@
 
 import typeof ReactTestRenderer from 'react-test-renderer';
 import type { GetInspectedElementPath } from 'src/devtools/views/Components/InspectedElementContext';
-import type Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 import type Store from 'src/devtools/store';
 
 describe('InspectedElementContext', () => {
   let React;
   let ReactDOM;
   let TestRenderer: ReactTestRenderer;
-  let bridge: Bridge;
+  let bridge: FrontendBridge;
   let store: Store;
   let meta;
   let utils;
diff --git a/src/__tests__/legacy/inspectElement-test.js b/src/__tests__/legacy/inspectElement-test.js
index f71d22343f150..7b8c2b04a9f52 100644
--- a/src/__tests__/legacy/inspectElement-test.js
+++ b/src/__tests__/legacy/inspectElement-test.js
@@ -2,7 +2,7 @@
 
 import type { InspectedElementPayload } from 'src/backend/types';
 import type { DehydratedData } from 'src/devtools/views/Components/types';
-import type Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 import type Store from 'src/devtools/store';
 
 describe('InspectedElementContext', () => {
@@ -10,7 +10,7 @@ describe('InspectedElementContext', () => {
   let ReactDOM;
   let hydrate;
   let meta;
-  let bridge: Bridge;
+  let bridge: FrontendBridge;
   let store: Store;
 
   const act = (callback: Function) => {
diff --git a/src/__tests__/ownersListContext-test.js b/src/__tests__/ownersListContext-test.js
index 7dde191cf997a..97681b70bdde5 100644
--- a/src/__tests__/ownersListContext-test.js
+++ b/src/__tests__/ownersListContext-test.js
@@ -2,14 +2,14 @@
 
 import typeof ReactTestRenderer from 'react-test-renderer';
 import type { Element } from 'src/devtools/views/Components/types';
-import type Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 import type Store from 'src/devtools/store';
 
 describe('OwnersListContext', () => {
   let React;
   let ReactDOM;
   let TestRenderer: ReactTestRenderer;
-  let bridge: Bridge;
+  let bridge: FrontendBridge;
   let store: Store;
   let utils;
 
diff --git a/src/__tests__/profilerContext-test.js b/src/__tests__/profilerContext-test.js
index 6857ddb4070cf..c06f70d0390d2 100644
--- a/src/__tests__/profilerContext-test.js
+++ b/src/__tests__/profilerContext-test.js
@@ -1,7 +1,7 @@
 // @flow
 
 import typeof ReactTestRenderer from 'react-test-renderer';
-import type Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 import type { Context } from 'src/devtools/views/Profiler/ProfilerContext';
 import type { DispatcherContext } from 'src/devtools/views/Components/TreeContext';
 import type Store from 'src/devtools/store';
@@ -10,7 +10,7 @@ describe('ProfilerContext', () => {
   let React;
   let ReactDOM;
   let TestRenderer: ReactTestRenderer;
-  let bridge: Bridge;
+  let bridge: FrontendBridge;
   let store: Store;
   let utils;
 
diff --git a/src/__tests__/profilingCache-test.js b/src/__tests__/profilingCache-test.js
index e5b56028936fd..6f6e4742cda4f 100644
--- a/src/__tests__/profilingCache-test.js
+++ b/src/__tests__/profilingCache-test.js
@@ -1,7 +1,7 @@
 // @flow
 
 import typeof ReactTestRenderer from 'react-test-renderer';
-import type Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 import type Store from 'src/devtools/store';
 
 describe('ProfilingCache', () => {
@@ -11,7 +11,7 @@ describe('ProfilingCache', () => {
   let Scheduler;
   let SchedulerTracing;
   let TestRenderer: ReactTestRenderer;
-  let bridge: Bridge;
+  let bridge: FrontendBridge;
   let store: Store;
   let utils;
 
diff --git a/src/__tests__/profilingCharts-test.js b/src/__tests__/profilingCharts-test.js
index dbf1ee16544b3..0e7fff951e940 100644
--- a/src/__tests__/profilingCharts-test.js
+++ b/src/__tests__/profilingCharts-test.js
@@ -29,7 +29,7 @@ describe('profiling charts', () => {
 
   describe('flamegraph chart', () => {
     it('should contain valid data', () => {
-      const Parent = ({ count }) => {
+      const Parent = (_: {||}) => {
         Scheduler.unstable_advanceTime(10);
         return (
           <React.Fragment>
@@ -105,7 +105,7 @@ describe('profiling charts', () => {
 
   describe('ranked chart', () => {
     it('should contain valid data', () => {
-      const Parent = ({ count }) => {
+      const Parent = (_: {||}) => {
         Scheduler.unstable_advanceTime(10);
         return (
           <React.Fragment>
@@ -177,7 +177,7 @@ describe('profiling charts', () => {
 
   describe('interactions', () => {
     it('should contain valid data', () => {
-      const Parent = ({ count }) => {
+      const Parent = (_: {||}) => {
         Scheduler.unstable_advanceTime(10);
         return (
           <React.Fragment>
diff --git a/src/__tests__/setupTests.js b/src/__tests__/setupTests.js
index 18127c4d47ad7..3fb0a57a2f279 100644
--- a/src/__tests__/setupTests.js
+++ b/src/__tests__/setupTests.js
@@ -1,5 +1,7 @@
 // @flow
 
+import type { BackendBridge, FrontendBridge } from 'src/bridge';
+
 const env = jasmine.getEnv();
 env.beforeEach(() => {
   // These files should be required (and re-reuired) before each test,
@@ -51,13 +53,13 @@ env.beforeEach(() => {
     },
   });
 
-  const agent = new Agent(bridge);
+  const agent = new Agent(((bridge: any): BackendBridge));
 
   const hook = global.__REACT_DEVTOOLS_GLOBAL_HOOK__;
 
   initBackend(hook, agent, global);
 
-  const store = new Store(bridge);
+  const store = new Store(((bridge: any): FrontendBridge));
 
   global.agent = agent;
   global.bridge = bridge;
diff --git a/src/__tests__/storeComponentFilters-test.js b/src/__tests__/storeComponentFilters-test.js
index 3b7cfa53010d3..5e2385b33b96b 100644
--- a/src/__tests__/storeComponentFilters-test.js
+++ b/src/__tests__/storeComponentFilters-test.js
@@ -1,6 +1,6 @@
 // @flow
 
-import type Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 import type Store from 'src/devtools/store';
 
 describe('Store component filters', () => {
@@ -8,7 +8,7 @@ describe('Store component filters', () => {
   let ReactDOM;
   let TestUtils;
   let Types;
-  let bridge: Bridge;
+  let bridge: FrontendBridge;
   let store: Store;
   let utils;
 
diff --git a/src/__tests__/treeContext-test.js b/src/__tests__/treeContext-test.js
index 09940efe95dd0..ecf8d47717436 100644
--- a/src/__tests__/treeContext-test.js
+++ b/src/__tests__/treeContext-test.js
@@ -1,7 +1,7 @@
 // @flow
 
 import typeof ReactTestRenderer from 'react-test-renderer';
-import type Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 import type Store from 'src/devtools/store';
 import type {
   DispatcherContext,
@@ -12,7 +12,7 @@ describe('TreeListContext', () => {
   let React;
   let ReactDOM;
   let TestRenderer: ReactTestRenderer;
-  let bridge: Bridge;
+  let bridge: FrontendBridge;
   let store: Store;
   let utils;
 
diff --git a/src/__tests__/utils.js b/src/__tests__/utils.js
index 345b773832aaf..bf0c816109fa0 100644
--- a/src/__tests__/utils.js
+++ b/src/__tests__/utils.js
@@ -2,7 +2,7 @@
 
 import typeof ReactTestRenderer from 'react-test-renderer';
 
-import type Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 import type Store from 'src/devtools/store';
 import type { ProfilingDataFrontend } from 'src/devtools/views/Profiler/types';
 import type { ElementType } from 'src/types';
@@ -161,7 +161,7 @@ export function requireTestRenderer(): ReactTestRenderer {
   }
 }
 
-export function exportImportHelper(bridge: Bridge, store: Store): void {
+export function exportImportHelper(bridge: FrontendBridge, store: Store): void {
   const { act } = require('./utils');
   const {
     prepareProfilingDataExport,
diff --git a/src/backend/NativeStyleEditor/setupNativeStyleEditor.js b/src/backend/NativeStyleEditor/setupNativeStyleEditor.js
index 5880bbac4d407..642dbb91eb87e 100644
--- a/src/backend/NativeStyleEditor/setupNativeStyleEditor.js
+++ b/src/backend/NativeStyleEditor/setupNativeStyleEditor.js
@@ -1,16 +1,16 @@
 // @flow
 
 import Agent from 'src/backend/agent';
-import Bridge from 'src/bridge';
 import resolveBoxStyle from './resolveBoxStyle';
 
+import type { BackendBridge } from 'src/bridge';
 import type { RendererID } from '../types';
 import type { StyleAndLayout } from './types';
 
 export type ResolveNativeStyle = (stylesheetID: number) => ?Object;
 
 export default function setupNativeStyleEditor(
-  bridge: Bridge,
+  bridge: BackendBridge,
   agent: Agent,
   resolveNativeStyle: ResolveNativeStyle,
   validAttributes?: $ReadOnlyArray<string> | null
@@ -81,7 +81,7 @@ const componentIDToStyleOverrides: Map<number, Object> = new Map();
 
 function measureStyle(
   agent: Agent,
-  bridge: Bridge,
+  bridge: BackendBridge,
   resolveNativeStyle: ResolveNativeStyle,
   id: number,
   rendererID: RendererID
diff --git a/src/backend/agent.js b/src/backend/agent.js
index fadd2e697ee55..9d8c4cff37103 100644
--- a/src/backend/agent.js
+++ b/src/backend/agent.js
@@ -2,7 +2,6 @@
 
 import EventEmitter from 'events';
 import throttle from 'lodash.throttle';
-import Bridge from 'src/bridge';
 import {
   SESSION_STORAGE_LAST_SELECTION_KEY,
   SESSION_STORAGE_RELOAD_AND_PROFILE_KEY,
@@ -17,6 +16,7 @@ import {
 import setupHighlighter from './views/Highlighter';
 import { patch as patchConsole, unpatch as unpatchConsole } from './console';
 
+import type { BackendBridge } from 'src/bridge';
 import type {
   InstanceAndStyle,
   NativeType,
@@ -81,14 +81,14 @@ export default class Agent extends EventEmitter<{|
   showNativeHighlight: [NativeType],
   shutdown: [],
 |}> {
-  _bridge: Bridge;
+  _bridge: BackendBridge;
   _isProfiling: boolean = false;
   _recordChangeDescriptions: boolean = false;
   _rendererInterfaces: { [key: RendererID]: RendererInterface } = {};
   _persistedSelection: PersistedSelection | null = null;
   _persistedSelectionMatch: PathMatch | null = null;
 
-  constructor(bridge: Bridge) {
+  constructor(bridge: BackendBridge) {
     super();
 
     if (
@@ -259,7 +259,7 @@ export default class Agent extends EventEmitter<{|
     dataURL: string,
     rootID: number,
   |}) => {
-    this._bridge.send('screenshotCaptured', { commitIndex, dataURL });
+    this._bridge.send('screenshotCaptured', { commitIndex, dataURL, rootID });
   };
 
   selectElement = ({ id, rendererID }: ElementAndRendererID) => {
diff --git a/src/backend/views/Highlighter/Overlay.js b/src/backend/views/Highlighter/Overlay.js
index 55ef361dc6278..f2190066b4791 100644
--- a/src/backend/views/Highlighter/Overlay.js
+++ b/src/backend/views/Highlighter/Overlay.js
@@ -11,6 +11,8 @@ type Rect = {
   width: number,
 };
 
+type Box = {| top: number, left: number, width: number, height: number |};
+
 // Note that the Overlay components are not affected by the active Theme,
 // because they highlight elements in the main Chrome window (outside of devtools).
 // The colors below were chosen to roughly match those used by Chrome devtools.
@@ -21,7 +23,7 @@ class OverlayRect {
   padding: HTMLElement;
   content: HTMLElement;
 
-  constructor(doc, container) {
+  constructor(doc: Document, container: HTMLElement) {
     this.node = doc.createElement('div');
     this.border = doc.createElement('div');
     this.padding = doc.createElement('div');
@@ -51,7 +53,7 @@ class OverlayRect {
     }
   }
 
-  update(box, dims) {
+  update(box: Rect, dims: any) {
     boxWrap(dims, 'margin', this.node);
     boxWrap(dims, 'border', this.border);
     boxWrap(dims, 'padding', this.padding);
@@ -85,7 +87,7 @@ class OverlayTip {
   nameSpan: HTMLElement;
   dimSpan: HTMLElement;
 
-  constructor(doc, container) {
+  constructor(doc: Document, container: HTMLElement) {
     this.tip = doc.createElement('div');
     assign(this.tip.style, {
       display: 'flex',
@@ -126,13 +128,13 @@ class OverlayTip {
     }
   }
 
-  updateText(name, width, height) {
+  updateText(name: string, width: number, height: number) {
     this.nameSpan.textContent = name;
     this.dimSpan.textContent =
       Math.round(width) + 'px × ' + Math.round(height) + 'px';
   }
 
-  updatePosition(dims, bounds) {
+  updatePosition(dims: Box, bounds: Box) {
     const tipRect = this.tip.getBoundingClientRect();
     const tipPos = findTipPos(dims, bounds, {
       width: tipRect.width,
@@ -247,6 +249,7 @@ export default class Overlay {
       this.tipBoundsWindow.document.documentElement,
       this.window
     );
+
     this.tip.updatePosition(
       {
         top: outerBox.top,
diff --git a/src/backend/views/Highlighter/index.js b/src/backend/views/Highlighter/index.js
index 3096b6fab3ebd..70d64e4cbc058 100644
--- a/src/backend/views/Highlighter/index.js
+++ b/src/backend/views/Highlighter/index.js
@@ -2,11 +2,15 @@
 
 import memoize from 'memoize-one';
 import throttle from 'lodash.throttle';
-import Bridge from 'src/bridge';
 import Agent from 'src/backend/agent';
 import { hideOverlay, showOverlay } from './Highlighter';
 
-export default function setup(bridge: Bridge, agent: Agent): void {
+import type { BackendBridge } from 'src/bridge';
+
+export default function setupHighlighter(
+  bridge: BackendBridge,
+  agent: Agent
+): void {
   bridge.addListener(
     'clearNativeElementHighlight',
     clearNativeElementHighlight
@@ -50,7 +54,7 @@ export default function setup(bridge: Bridge, agent: Agent): void {
     rendererID,
     scrollIntoView,
   }: {
-    displayName: string,
+    displayName: string | null,
     hideAfterTimeout: boolean,
     id: number,
     openNativeElementsPanel: boolean,
diff --git a/src/bridge.js b/src/bridge.js
index 23b887af7fc7e..b8ab73e710e9a 100644
--- a/src/bridge.js
+++ b/src/bridge.js
@@ -22,7 +22,7 @@ type Message = {|
 
 type HighlightElementInDOM = {|
   ...ElementAndRendererID,
-  displayName: string,
+  displayName: string | null,
   hideAfterTimeout: boolean,
   openNativeElementsPanel: boolean,
   scrollIntoView: boolean,
@@ -62,33 +62,48 @@ type NativeStyleEditor_SetValueParams = {|
   value: string,
 |};
 
-export default class Bridge extends EventEmitter<{|
+type BackendEvents = {|
+  captureScreenshot: [{| commitIndex: number, rootID: number |}],
+  inspectedElement: [InspectedElementPayload],
+  isBackendStorageAPISupported: [boolean],
+  operations: [Array<number>],
+  ownersList: [OwnersList],
+  overrideComponentFilters: [Array<ComponentFilter>],
+  profilingData: [ProfilingDataBackend],
+  profilingStatus: [boolean],
+  reloadAppForProfiling: [],
+  screenshotCaptured: [
+    {| commitIndex: number, dataURL: string, rootID: number |},
+  ],
+  selectFiber: [number],
+  shutdown: [],
+  stopInspectingNative: [boolean],
+  syncSelectionFromNativeElementsPanel: [],
+  syncSelectionToNativeElementsPanel: [],
+
+  // React Native style editor plug-in.
+  isNativeStyleEditorSupported: [
+    {| isSupported: boolean, validAttributes: ?$ReadOnlyArray<string> |},
+  ],
+  NativeStyleEditor_styleAndLayout: [StyleAndLayoutPayload],
+|};
+
+type FrontendEvents = {|
   captureScreenshot: [{| commitIndex: number, rootID: number |}],
   clearNativeElementHighlight: [],
   getOwnersList: [ElementAndRendererID],
   getProfilingData: [{| rendererID: RendererID |}],
   getProfilingStatus: [],
   highlightNativeElement: [HighlightElementInDOM],
-  init: [],
   inspectElement: [InspectElementParams],
-  inspectedElement: [InspectedElementPayload],
-  isBackendStorageAPISupported: [boolean],
   logElementToConsole: [ElementAndRendererID],
-  operations: [Array<number>],
-  ownersList: [OwnersList],
-  overrideComponentFilters: [Array<ComponentFilter>],
   overrideContext: [OverrideValue],
   overrideHookState: [OverrideHookState],
   overrideProps: [OverrideValue],
   overrideState: [OverrideValue],
   overrideSuspense: [OverrideSuspense],
   profilingData: [ProfilingDataBackend],
-  profilingStatus: [boolean],
   reloadAndProfile: [boolean],
-  reloadAppForProfiling: [],
-  screenshotCaptured: [
-    {| commitIndex: number, dataURL: string, rootID: number |},
-  ],
   selectElement: [ElementAndRendererID],
   selectFiber: [number],
   shutdown: [],
@@ -96,20 +111,22 @@ export default class Bridge extends EventEmitter<{|
   startProfiling: [boolean],
   stopInspectingNative: [boolean],
   stopProfiling: [],
-  syncSelectionFromNativeElementsPanel: [],
-  syncSelectionToNativeElementsPanel: [],
   updateAppendComponentStack: [boolean],
   updateComponentFilters: [Array<ComponentFilter>],
   viewElementSource: [ElementAndRendererID],
 
   // React Native style editor plug-in.
-  isNativeStyleEditorSupported: [
-    {| isSupported: boolean, validAttributes: $ReadOnlyArray<string> |},
-  ],
   NativeStyleEditor_measure: [ElementAndRendererID],
   NativeStyleEditor_renameAttribute: [NativeStyleEditor_RenameAttributeParams],
   NativeStyleEditor_setValue: [NativeStyleEditor_SetValueParams],
-  NativeStyleEditor_styleAndLayout: [StyleAndLayoutPayload],
+|};
+
+class Bridge<
+  OutgoingEvents: Object,
+  IncomingEvents: Object
+> extends EventEmitter<{|
+  ...IncomingEvents,
+  ...OutgoingEvents,
 |}> {
   _isShutdown: boolean = false;
   _messageQueue: Array<any> = [];
@@ -134,7 +151,10 @@ export default class Bridge extends EventEmitter<{|
     return this._wall;
   }
 
-  send(event: string, payload: any, transferable?: Array<any>) {
+  send<EventName: $Keys<OutgoingEvents>>(
+    event: EventName,
+    ...payload: $ElementType<OutgoingEvents, EventName>
+  ) {
     if (this._isShutdown) {
       console.warn(
         `Cannot send message "${event}" through a Bridge that has been shutdown.`
@@ -150,7 +170,7 @@ export default class Bridge extends EventEmitter<{|
     // - if there *has* been a message flushed in the last BATCH_DURATION ms
     //   (or we're waiting for our setTimeout-0 to fire), then _timeoutID will
     //   be set, and we'll simply add to the queue and wait for that
-    this._messageQueue.push(event, payload, transferable);
+    this._messageQueue.push(event, payload);
     if (!this._timeoutID) {
       this._timeoutID = setTimeout(this._flush, 0);
     }
@@ -204,12 +224,8 @@ export default class Bridge extends EventEmitter<{|
     this._timeoutID = null;
 
     if (this._messageQueue.length) {
-      for (let i = 0; i < this._messageQueue.length; i += 3) {
-        this._wall.send(
-          this._messageQueue[i],
-          this._messageQueue[i + 1],
-          this._messageQueue[i + 2]
-        );
+      for (let i = 0; i < this._messageQueue.length; i += 2) {
+        this._wall.send(this._messageQueue[i], ...this._messageQueue[i + 1]);
       }
       this._messageQueue.length = 0;
 
@@ -220,3 +236,8 @@ export default class Bridge extends EventEmitter<{|
     }
   };
 }
+
+export type BackendBridge = Bridge<BackendEvents, FrontendEvents>;
+export type FrontendBridge = Bridge<FrontendEvents, BackendEvents>;
+
+export default Bridge;
diff --git a/src/devtools/ProfilerStore.js b/src/devtools/ProfilerStore.js
index bf2e8544a3f66..eb79c41e65b09 100644
--- a/src/devtools/ProfilerStore.js
+++ b/src/devtools/ProfilerStore.js
@@ -3,11 +3,11 @@
 import EventEmitter from 'events';
 import memoize from 'memoize-one';
 import throttle from 'lodash.throttle';
-import Bridge from 'src/bridge';
 import { prepareProfilingDataFrontendFromBackendAndStore } from './views/Profiler/utils';
 import ProfilingCache from './ProfilingCache';
 import Store from './store';
 
+import type { FrontendBridge } from 'src/bridge';
 import type { ProfilingDataBackend } from 'src/backend/types';
 import type {
   CommitDataFrontend,
@@ -23,7 +23,7 @@ export default class ProfilerStore extends EventEmitter<{|
   isProfiling: [],
   profilingData: [],
 |}> {
-  _bridge: Bridge;
+  _bridge: FrontendBridge;
 
   // Suspense cache for lazily calculating derived profiling data.
   _cache: ProfilingCache;
@@ -79,7 +79,11 @@ export default class ProfilerStore extends EventEmitter<{|
 
   _store: Store;
 
-  constructor(bridge: Bridge, store: Store, defaultIsProfiling: boolean) {
+  constructor(
+    bridge: FrontendBridge,
+    store: Store,
+    defaultIsProfiling: boolean
+  ) {
     super();
 
     this._bridge = bridge;
diff --git a/src/devtools/index.js b/src/devtools/index.js
index b41b51a1102dd..33e628e96542a 100644
--- a/src/devtools/index.js
+++ b/src/devtools/index.js
@@ -1,6 +1,6 @@
 // @flow
 
-import Bridge from 'src/bridge';
+import type { FrontendBridge } from 'src/bridge';
 
 type Shell = {|
   connect: (callback: Function) => void,
@@ -8,7 +8,7 @@ type Shell = {|
 |};
 
 export function initDevTools(shell: Shell) {
-  shell.connect((bridge: Bridge) => {
+  shell.connect((bridge: FrontendBridge) => {
     // TODO ...
   });
 }
diff --git a/src/devtools/store.js b/src/devtools/store.js
index 2c778a0ccd002..5b3e6a34d75f7 100644
--- a/src/devtools/store.js
+++ b/src/devtools/store.js
@@ -2,7 +2,6 @@
 
 import EventEmitter from 'events';
 import { inspect } from 'util';
-import Bridge from 'src/bridge';
 import {
   TREE_OPERATION_ADD,
   TREE_OPERATION_REMOVE,
@@ -24,6 +23,7 @@ import ProfilerStore from './ProfilerStore';
 
 import type { Element } from './views/Components/types';
 import type { ComponentFilter, ElementType } from '../types';
+import type { FrontendBridge } from 'src/bridge';
 
 const debug = (methodName, ...args) => {
   if (__DEBUG__) {
@@ -71,7 +71,7 @@ export default class Store extends EventEmitter<{|
   supportsProfiling: [],
   supportsReloadAndProfile: [],
 |}> {
-  _bridge: Bridge;
+  _bridge: FrontendBridge;
 
   _captureScreenshots: boolean = false;
 
@@ -129,7 +129,7 @@ export default class Store extends EventEmitter<{|
   // Used for windowing purposes.
   _weightAcrossRoots: number = 0;
 
-  constructor(bridge: Bridge, config?: Config) {
+  constructor(bridge: FrontendBridge, config?: Config) {
     super();
 
     if (__DEBUG__) {
@@ -701,7 +701,7 @@ export default class Store extends EventEmitter<{|
     validAttributes,
   }: {|
     isSupported: boolean,
-    validAttributes: $ReadOnlyArray<string>,
+    validAttributes: ?$ReadOnlyArray<string>,
   |}) => {
     this._isNativeStyleEditorSupported = isSupported;
     this._nativeStyleEditorValidAttributes = validAttributes || null;
diff --git a/src/devtools/views/Components/HooksTree.js b/src/devtools/views/Components/HooksTree.js
index 0c3b3e79b2a57..10df0c470a65e 100644
--- a/src/devtools/views/Components/HooksTree.js
+++ b/src/devtools/views/Components/HooksTree.js
@@ -221,17 +221,19 @@ function HookView({
     if (canEditHooks && isStateEditable) {
       overrideValueFn = (absolutePath: Array<string | number>, value: any) => {
         const rendererID = store.getRendererIDForElement(id);
-        bridge.send('overrideHookState', {
-          id,
-          hookID,
-          // Hooks override function expects a relative path for the specified hook (id),
-          // starting with its id within the (flat) hooks list structure.
-          // This relative path does not include the fake tree structure DevTools uses for display,
-          // so it's important that we remove that part of the path before sending the update.
-          path: absolutePath.slice(path.length + 1),
-          rendererID,
-          value,
-        });
+        if (rendererID !== null) {
+          bridge.send('overrideHookState', {
+            id,
+            hookID,
+            // Hooks override function expects a relative path for the specified hook (id),
+            // starting with its id within the (flat) hooks list structure.
+            // This relative path does not include the fake tree structure DevTools uses for display,
+            // so it's important that we remove that part of the path before sending the update.
+            path: absolutePath.slice(path.length + 1),
+            rendererID,
+            value,
+          });
+        }
       };
     }
 
diff --git a/src/devtools/views/Components/InspectedElementContext.js b/src/devtools/views/Components/InspectedElementContext.js
index 97efcac574ff2..31841774eb631 100644
--- a/src/devtools/views/Components/InspectedElementContext.js
+++ b/src/devtools/views/Components/InspectedElementContext.js
@@ -85,7 +85,9 @@ function InspectedElementContextController({ children }: Props) {
   const getInspectedElementPath = useCallback<GetInspectedElementPath>(
     (id: number, path: Array<string | number>) => {
       const rendererID = store.getRendererIDForElement(id);
-      bridge.send('inspectElement', { id, path, rendererID });
+      if (rendererID !== null) {
+        bridge.send('inspectElement', { id, path, rendererID });
+      }
     },
     [bridge, store]
   );
@@ -232,7 +234,9 @@ function InspectedElementContextController({ children }: Props) {
     const sendRequest = () => {
       timeoutID = null;
 
-      bridge.send('inspectElement', { id: selectedElementID, rendererID });
+      if (rendererID !== null) {
+        bridge.send('inspectElement', { id: selectedElementID, rendererID });
+      }
     };
 
     // Send the initial inspection request.
@@ -240,7 +244,9 @@ function InspectedElementContextController({ children }: Props) {
     sendRequest();
 
     // Update the $r variable.
-    bridge.send('selectElement', { id: selectedElementID, rendererID });
+    if (rendererID !== null) {
+      bridge.send('selectElement', { id: selectedElementID, rendererID });
+    }
 
     const onInspectedElement = (data: InspectedElementPayload) => {
       // If this is the element we requested, wait a little bit and then ask for another update.
diff --git a/src/devtools/views/Components/NativeStyleEditor/StyleEditor.js b/src/devtools/views/Components/NativeStyleEditor/StyleEditor.js
index 570f473355eea..94d6923c37f1d 100644
--- a/src/devtools/views/Components/NativeStyleEditor/StyleEditor.js
+++ b/src/devtools/views/Components/NativeStyleEditor/StyleEditor.js
@@ -25,22 +25,28 @@ export default function StyleEditor({ id, style }: Props) {
   const store = useContext(StoreContext);
 
   const changeAttribute = (oldName: string, newName: string, value: any) => {
-    bridge.send('NativeStyleEditor_renameAttribute', {
-      id,
-      rendererID: store.getRendererIDForElement(id),
-      oldName,
-      newName,
-      value,
-    });
+    const rendererID = store.getRendererIDForElement(id);
+    if (rendererID !== null) {
+      bridge.send('NativeStyleEditor_renameAttribute', {
+        id,
+        rendererID,
+        oldName,
+        newName,
+        value,
+      });
+    }
   };
 
   const changeValue = (name: string, value: any) => {
-    bridge.send('NativeStyleEditor_setValue', {
-      id,
-      rendererID: store.getRendererIDForElement(id),
-      name,
-      value,
-    });
+    const rendererID = store.getRendererIDForElement(id);
+    if (rendererID !== null) {
+      bridge.send('NativeStyleEditor_setValue', {
+        id,
+        rendererID,
+        name,
+        value,
+      });
+    }
   };
 
   const keys = useMemo(() => Array.from(Object.keys(style)), [style]);
diff --git a/src/devtools/views/Components/NativeStyleEditor/context.js b/src/devtools/views/Components/NativeStyleEditor/context.js
index 927a4d4151d58..f062fef43e57a 100644
--- a/src/devtools/views/Components/NativeStyleEditor/context.js
+++ b/src/devtools/views/Components/NativeStyleEditor/context.js
@@ -136,10 +136,12 @@ function NativeStyleContextController({ children }: Props) {
     const sendRequest = () => {
       timeoutID = null;
 
-      bridge.send('NativeStyleEditor_measure', {
-        id: selectedElementID,
-        rendererID,
-      });
+      if (rendererID !== null) {
+        bridge.send('NativeStyleEditor_measure', {
+          id: selectedElementID,
+          rendererID,
+        });
+      }
     };
 
     // Send the initial measurement request.
diff --git a/src/devtools/views/Components/OwnersListContext.js b/src/devtools/views/Components/OwnersListContext.js
index aa7e2dab0503f..6da02d3546ed8 100644
--- a/src/devtools/views/Components/OwnersListContext.js
+++ b/src/devtools/views/Components/OwnersListContext.js
@@ -106,8 +106,9 @@ function OwnersListContextController({ children }: Props) {
   useEffect(() => {
     if (ownerID !== null) {
       const rendererID = store.getRendererIDForElement(ownerID);
-
-      bridge.send('getOwnersList', { id: ownerID, rendererID });
+      if (rendererID !== null) {
+        bridge.send('getOwnersList', { id: ownerID, rendererID });
+      }
     }
 
     return () => {};
diff --git a/src/devtools/views/Components/SelectedElement.js b/src/devtools/views/Components/SelectedElement.js
index 2d3eece429544..ecc12028c94e2 100644
--- a/src/devtools/views/Components/SelectedElement.js
+++ b/src/devtools/views/Components/SelectedElement.js
@@ -140,12 +140,18 @@ export default function SelectedElement(_: Props) {
         });
       }
 
+      const rendererID = store.getRendererIDForElement(
+        nearestSuspenseElementID
+      );
+
       // Toggle suspended
-      bridge.send('overrideSuspense', {
-        id: nearestSuspenseElementID,
-        rendererID: store.getRendererIDForElement(nearestSuspenseElementID),
-        forceFallback: !isSuspended,
-      });
+      if (rendererID !== null) {
+        bridge.send('overrideSuspense', {
+          id: nearestSuspenseElementID,
+          rendererID,
+          forceFallback: !isSuspended,
+        });
+      }
     }
   }, [bridge, dispatch, element, isSuspended, modalDialogDispatch, store]);
 
@@ -280,15 +286,21 @@ function InspectedElementView({
   if (type === ElementTypeClass) {
     overrideContextFn = (path: Array<string | number>, value: any) => {
       const rendererID = store.getRendererIDForElement(id);
-      bridge.send('overrideContext', { id, path, rendererID, value });
+      if (rendererID !== null) {
+        bridge.send('overrideContext', { id, path, rendererID, value });
+      }
     };
     overridePropsFn = (path: Array<string | number>, value: any) => {
       const rendererID = store.getRendererIDForElement(id);
-      bridge.send('overrideProps', { id, path, rendererID, value });
+      if (rendererID !== null) {
+        bridge.send('overrideProps', { id, path, rendererID, value });
+      }
     };
     overrideStateFn = (path: Array<string | number>, value: any) => {
       const rendererID = store.getRendererIDForElement(id);
-      bridge.send('overrideState', { id, path, rendererID, value });
+      if (rendererID !== null) {
+        bridge.send('overrideState', { id, path, rendererID, value });
+      }
     };
   } else if (
     (type === ElementTypeFunction ||
@@ -298,7 +310,9 @@ function InspectedElementView({
   ) {
     overridePropsFn = (path: Array<string | number>, value: any) => {
       const rendererID = store.getRendererIDForElement(id);
-      bridge.send('overrideProps', { id, path, rendererID, value });
+      if (rendererID !== null) {
+        bridge.send('overrideProps', { id, path, rendererID, value });
+      }
     };
   } else if (type === ElementTypeSuspense && canToggleSuspense) {
     overrideSuspenseFn = (path: Array<string | number>, value: boolean) => {
@@ -306,7 +320,13 @@ function InspectedElementView({
         throw new Error('Unexpected path.');
       }
       const rendererID = store.getRendererIDForElement(id);
-      bridge.send('overrideSuspense', { id, rendererID, forceFallback: value });
+      if (rendererID !== null) {
+        bridge.send('overrideSuspense', {
+          id,
+          rendererID,
+          forceFallback: value,
+        });
+      }
     };
   }
 
diff --git a/src/devtools/views/Components/Tree.js b/src/devtools/views/Components/Tree.js
index 85d3ef1658197..285cb39c41655 100644
--- a/src/devtools/views/Components/Tree.js
+++ b/src/devtools/views/Components/Tree.js
@@ -192,7 +192,7 @@ export default function Tree(props: Props) {
     (id: number) => {
       const element = store.getElementByID(id);
       const rendererID = store.getRendererIDForElement(id);
-      if (element !== null) {
+      if (element !== null && rendererID !== null) {
         bridge.send('highlightNativeElement', {
           displayName: element.displayName,
           hideAfterTimeout: false,
diff --git a/src/devtools/views/DevTools.js b/src/devtools/views/DevTools.js
index f8d9bcec9186b..1aab4afaef5b8 100644
--- a/src/devtools/views/DevTools.js
+++ b/src/devtools/views/DevTools.js
@@ -6,7 +6,6 @@ import '@reach/menu-button/styles.css';
 import '@reach/tooltip/styles.css';
 
 import React, { useMemo, useState } from 'react';
-import Bridge from 'src/bridge';
 import Store from '../store';
 import { BridgeContext, StoreContext } from './context';
 import Components from './Components/Components';
@@ -25,6 +24,7 @@ import styles from './DevTools.css';
 import './root.css';
 
 import type { InspectedElement } from 'src/devtools/views/Components/types';
+import type { FrontendBridge } from 'src/bridge';
 
 export type BrowserTheme = 'dark' | 'light';
 export type TabID = 'components' | 'profiler' | 'settings';
@@ -34,7 +34,7 @@ export type ViewElementSource = (
 ) => void;
 
 export type Props = {|
-  bridge: Bridge,
+  bridge: FrontendBridge,
   browserTheme?: BrowserTheme,
   defaultTab?: TabID,
   showTabBar?: boolean,
diff --git a/src/devtools/views/context.js b/src/devtools/views/context.js
index e5ede9ef48a04..96c654a94397f 100644
--- a/src/devtools/views/context.js
+++ b/src/devtools/views/context.js
@@ -1,11 +1,13 @@
 // @flow
 
 import { createContext } from 'react';
-import Bridge from 'src/bridge';
-
 import Store from '../store';
 
-export const BridgeContext = createContext<Bridge>(((null: any): Bridge));
+import type { FrontendBridge } from 'src/bridge';
+
+export const BridgeContext = createContext<FrontendBridge>(
+  ((null: any): FrontendBridge)
+);
 BridgeContext.displayName = 'BridgeContext';
 
 export const StoreContext = createContext<Store>(((null: any): Store));
diff --git a/vendor/react-window/dist/index-dev.umd.js b/vendor/react-window/dist/index-dev.umd.js
new file mode 100644
index 0000000000000..96dc2ae17a611
--- /dev/null
+++ b/vendor/react-window/dist/index-dev.umd.js
@@ -0,0 +1,2 @@
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports,require("react")):"function"==typeof define&&define.amd?define(["exports","react"],t):t((e=e||self).ReactWindow={},e.React)}(this,function(e,t){"use strict";function r(){return(r=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var r=arguments[t];for(var n in r)Object.prototype.hasOwnProperty.call(r,n)&&(e[n]=r[n])}return e}).apply(this,arguments)}function n(e,t){e.prototype=Object.create(t.prototype),e.prototype.constructor=e,e.__proto__=t}function o(e){if(void 0===e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return e}var i=function(e,t){return e.length===t.length&&e.every(function(e,r){return n=e,o=t[r],n===o;var n,o})};function a(e,t){var r;void 0===t&&(t=i);var n,o=[],a=!1;return function(){for(var i=arguments.length,l=new Array(i),s=0;s<i;s++)l[s]=arguments[s];return a&&r===this&&t(l,o)?n:(n=e.apply(this,l),a=!0,r=this,o=l,n)}}var l="object"==typeof performance&&"function"==typeof performance.now?function(){return performance.now()}:function(){return Date.now()};function s(e){cancelAnimationFrame(e.id)}function c(e,t){var r=l();var n={id:requestAnimationFrame(function o(){l()-r>=t?e.call(null):n.id=requestAnimationFrame(o)})};return n}var u=-1;var d=null;function f(e){if(void 0===e&&(e=!1),null===d||e){var t=document.createElement("div"),r=t.style;r.width="50px",r.height="50px",r.overflow="scroll",r.direction="rtl";var n=document.createElement("div"),o=n.style;return o.width="100px",o.height="100px",t.appendChild(n),document.body.appendChild(t),t.scrollLeft>0?d="positive-descending":(t.scrollLeft=1,d=0===t.scrollLeft?"negative":"positive-ascending"),document.body.removeChild(t),d}return d}var h=150,p=function(e){var t=e.columnIndex;e.data;return e.rowIndex+":"+t},m=null,v=null,g=null;function w(e){var i,l,d=e.getColumnOffset,m=e.getColumnStartIndexForOffset,v=e.getColumnStopIndexForStartIndex,g=e.getColumnWidth,w=e.getEstimatedTotalHeight,I=e.getEstimatedTotalWidth,M=e.getOffsetForColumnAndAlignment,y=e.getOffsetForRowAndAlignment,x=e.getRowHeight,C=e.getRowOffset,_=e.getRowStartIndexForOffset,b=e.getRowStopIndexForStartIndex,R=e.initInstanceProps,T=e.shouldResetStyleCacheOnItemSizeChange,z=e.validateProps;return l=i=function(e){function i(t){var r;return(r=e.call(this,t)||this)._instanceProps=R(r.props,o(o(r))),r._resetIsScrollingTimeoutId=null,r._outerRef=void 0,r.state={instance:o(o(r)),isScrolling:!1,horizontalScrollDirection:"forward",scrollLeft:"number"==typeof r.props.initialScrollLeft?r.props.initialScrollLeft:0,scrollTop:"number"==typeof r.props.initialScrollTop?r.props.initialScrollTop:0,scrollUpdateWasRequested:!1,verticalScrollDirection:"forward"},r._callOnItemsRendered=void 0,r._callOnItemsRendered=a(function(e,t,n,o,i,a,l,s){return r.props.onItemsRendered({overscanColumnStartIndex:e,overscanColumnStopIndex:t,overscanRowStartIndex:n,overscanRowStopIndex:o,visibleColumnStartIndex:i,visibleColumnStopIndex:a,visibleRowStartIndex:l,visibleRowStopIndex:s})}),r._callOnScroll=void 0,r._callOnScroll=a(function(e,t,n,o,i){return r.props.onScroll({horizontalScrollDirection:n,scrollLeft:e,scrollTop:t,verticalScrollDirection:o,scrollUpdateWasRequested:i})}),r._getItemStyle=void 0,r._getItemStyle=function(e,t){var n,o,i=r.props,a=i.columnWidth,l=i.direction,s=i.rowHeight,c=r._getItemStyleCache(T&&a,T&&l,T&&s),u=e+":"+t;c.hasOwnProperty(u)?n=c[u]:c[u]=((o={position:"absolute"})["rtl"===l?"right":"left"]=d(r.props,t,r._instanceProps),o.top=C(r.props,e,r._instanceProps),o.height=x(r.props,e,r._instanceProps),o.width=g(r.props,t,r._instanceProps),n=o);return n},r._getItemStyleCache=void 0,r._getItemStyleCache=a(function(e,t,r){return{}}),r._onScroll=function(e){var t=e.currentTarget,n=t.clientHeight,o=t.clientWidth,i=t.scrollLeft,a=t.scrollTop,l=t.scrollHeight,s=t.scrollWidth;r.setState(function(e){if(e.scrollLeft===i&&e.scrollTop===a)return null;var t=r.props.direction,c=i;if("rtl"===t)switch(f()){case"negative":c=-i;break;case"positive-descending":c=s-o-i}c=Math.max(0,Math.min(c,s-o));var u=Math.max(0,Math.min(a,l-n));return{isScrolling:!0,horizontalScrollDirection:e.scrollLeft<i?"forward":"backward",scrollLeft:c,scrollTop:u,verticalScrollDirection:e.scrollTop<a?"forward":"backward",scrollUpdateWasRequested:!1}},r._resetIsScrollingDebounced)},r._outerRefSetter=function(e){var t=r.props.outerRef;r._outerRef=e,"function"==typeof t?t(e):null!=t&&"object"==typeof 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l="column"===t?e.width:e.height,s=I(t,e,r,i),c="column"===t?S(e,i):v(e,i),u=Math.max(0,Math.min(c-l,s.offset)),f=Math.max(0,s.offset-l+a+s.size);switch("smart"===o&&(o=n>=f-l&&n<=u+l?"auto":"center"),o){case"start":return u;case"end":return f;case"center":return Math.round(f+(u-f)/2);case"auto":default:return n>=f&&n<=u?n:f>u?f:n<f?f:u}},C=p({getColumnOffset:function(t,e,r){return I("column",t,e,r).offset},getColumnStartIndexForOffset:function(t,e,r){return w("column",t,r,e)},getColumnStopIndexForStartIndex:function(t,e,r,o){for(var n=t.columnCount,i=t.width,a=I("column",t,e,o),l=r+i,s=a.offset+a.size,c=e;c<n-1&&s<l;)s+=I("column",t,++c,o).size;return c},getColumnWidth:function(t,e,r){return r.columnMetadataMap[e].size},getEstimatedTotalHeight:v,getEstimatedTotalWidth:S,getOffsetForColumnAndAlignment:function(t,e,r,o,n,i){return _("column",t,e,r,o,n,i)},getOffsetForRowAndAlignment:function(t,e,r,o,n,i){return _("row",t,e,r,o,n,i)},getRowOffset:function(t,e,r){return I("row",t,e,r).offset},getRowHeight:function(t,e,r){return r.rowMetadataMap[e].size},getRowStartIndexForOffset:function(t,e,r){return w("row",t,r,e)},getRowStopIndexForStartIndex:function(t,e,r,o){for(var n=t.rowCount,i=t.height,a=I("row",t,e,o),l=r+i,s=a.offset+a.size,c=e;c<n-1&&s<l;)s+=I("row",t,++c,o).size;return c},initInstanceProps:function(t,e){var r=t,o={columnMetadataMap:{},estimatedColumnWidth:r.estimatedColumnWidth||50,estimatedRowHeight:r.estimatedRowHeight||50,lastMeasuredColumnIndex:-1,lastMeasuredRowIndex:-1,rowMetadataMap:{}};return e.resetAfterColumnIndex=function(t,r){void 0===r&&(r=!0),e.resetAfterIndices({columnIndex:t,shouldForceUpdate:r})},e.resetAfterRowIndex=function(t,r){void 0===r&&(r=!0),e.resetAfterIndices({rowIndex:t,shouldForceUpdate:r})},e.resetAfterIndices=function(t){var r=t.columnIndex,n=t.rowIndex,i=t.shouldForceUpdate,a=void 0===i||i;"number"==typeof r&&(o.lastMeasuredColumnIndex=Math.min(o.lastMeasuredColumnIndex,r-1)),"number"==typeof n&&(o.lastMeasuredRowIndex=Math.min(o.lastMeasuredRowIndex,n-1)),e._getItemStyleCache(-1),a&&e.forceUpdate()},o},shouldResetStyleCacheOnItemSizeChange:!1,validateProps:function(t){t.columnWidth,t.rowHeight}}),R=150,y=function(t,e){return t};function T(t){var i,l,u=t.getItemOffset,f=t.getEstimatedTotalSize,h=t.getItemSize,m=t.getOffsetForIndexAndAlignment,p=t.getStartIndexForOffset,g=t.getStopIndexForStartIndex,v=t.initInstanceProps,S=t.shouldResetStyleCacheOnItemSizeChange,I=t.validateProps;return l=i=function(t){function i(e){var r;return(r=t.call(this,e)||this)._instanceProps=v(r.props,n(n(r))),r._outerRef=void 0,r._resetIsScrollingTimeoutId=null,r.state={instance:n(n(r)),isScrolling:!1,scrollDirection:"forward",scrollOffset:"number"==typeof r.props.initialScrollOffset?r.props.initialScrollOffset:0,scrollUpdateWasRequested:!1},r._callOnItemsRendered=void 0,r._callOnItemsRendered=a(function(t,e,o,n){return r.props.onItemsRendered({overscanStartIndex:t,overscanStopIndex:e,visibleStartIndex:o,visibleStopIndex:n})}),r._callOnScroll=void 0,r._callOnScroll=a(function(t,e,o){return r.props.onScroll({scrollDirection:t,scrollOffset:e,scrollUpdateWasRequested:o})}),r._getItemStyle=void 0,r._getItemStyle=function(t){var e,o=r.props,n=o.direction,i=o.itemSize,a=o.layout,l=r._getItemStyleCache(S&&i,S&&a,S&&n);if(l.hasOwnProperty(t))e=l[t];else{var s,c=u(r.props,t,r._instanceProps),f=h(r.props,t,r._instanceProps),d="horizontal"===n||"horizontal"===a;l[t]=((s={position:"absolute"})["rtl"===n?"right":"left"]=d?c:0,s.top=d?0:c,s.height=d?"100%":f,s.width=d?f:"100%",e=s)}return e},r._getItemStyleCache=void 0,r._getItemStyleCache=a(function(t,e,r){return{}}),r._onScrollHorizontal=function(t){var e=t.currentTarget,o=e.clientWidth,n=e.scrollLeft,i=e.scrollWidth;r.setState(function(t){if(t.scrollOffset===n)return null;var e=r.props.direction,a=n;if("rtl"===e)switch(d()){case"negative":a=-n;break;case"positive-descending":a=i-o-n}return a=Math.max(0,Math.min(a,i-o)),{isScrolling:!0,scrollDirection:t.scrollOffset<n?"forward":"backward",scrollOffset:a,scrollUpdateWasRequested:!1}},r._resetIsScrollingDebounced)},r._onScrollVertical=function(t){var e=t.currentTarget,o=e.clientHeight,n=e.scrollHeight,i=e.scrollTop;r.setState(function(t){if(t.scrollOffset===i)return null;var e=Math.max(0,Math.min(i,n-o));return{isScrolling:!0,scrollDirection:t.scrollOffset<e?"forward":"backward",scrollOffset:e,scrollUpdateWasRequested:!1}},r._resetIsScrollingDebounced)},r._outerRefSetter=function(t){var e=r.props.outerRef;r._outerRef=t,"function"==typeof e?e(t):null!=e&&"object"==typeof e&&e.hasOwnProperty("current")&&(e.current=t)},r._resetIsScrollingDebounced=function(){null!==r._resetIsScrollingTimeoutId&&s(r._resetIsScrollingTimeoutId),r._resetIsScrollingTimeoutId=c(r._resetIsScrolling,R)},r._resetIsScrolling=function(){r._resetIsScrollingTimeoutId=null,r.setState({isScrolling:!1},function(){r._getItemStyleCache(-1,null)})},r}o(i,t),i.getDerivedStateFromProps=function(t,e){return O(t,e),I(t),null};var l=i.prototype;return l.scrollTo=function(t){t=Math.max(0,t),this.setState(function(e){return e.scrollOffset===t?null:{scrollDirection:e.scrollOffset<t?"forward":"backward",scrollOffset:t,scrollUpdateWasRequested:!0}},this._resetIsScrollingDebounced)},l.scrollToItem=function(t,e){void 0===e&&(e="auto");var r=this.props.itemCount,o=this.state.scrollOffset;t=Math.max(0,Math.min(t,r-1)),this.scrollTo(m(this.props,t,e,o,this._instanceProps))},l.componentDidMount=function(){var t=this.props,e=t.direction,r=t.initialScrollOffset,o=t.layout;if("number"==typeof r&&null!=this._outerRef){var n=this._outerRef;"horizontal"===e||"horizontal"===o?n.scrollLeft=r:n.scrollTop=r}this._callPropsCallbacks()},l.componentDidUpdate=function(){var t=this.props,e=t.direction,r=t.layout,o=this.state,n=o.scrollOffset;if(o.scrollUpdateWasRequested&&null!=this._outerRef){var i=this._outerRef;if("horizontal"===e||"horizontal"===r)if("rtl"===e)switch(d()){case"negative":i.scrollLeft=-n;break;case"positive-ascending":i.scrollLeft=n;break;default:var a=i.clientWidth,l=i.scrollWidth;i.scrollLeft=l-a-n}else i.scrollLeft=n;else i.scrollTop=n}this._callPropsCallbacks()},l.componentWillUnmount=function(){null!==this._resetIsScrollingTimeoutId&&s(this._resetIsScrollingTimeoutId)},l.render=function(){var t=this.props,o=t.children,n=t.className,i=t.direction,a=t.height,l=t.innerRef,s=t.innerElementType,c=t.innerTagName,u=t.itemCount,d=t.itemData,h=t.itemKey,m=void 0===h?y:h,p=t.layout,g=t.outerElementType,v=t.outerTagName,S=t.style,I=t.useIsScrolling,w=t.width,M=this.state.isScrolling,x="horizontal"===i||"horizontal"===p,_=x?this._onScrollHorizontal:this._onScrollVertical,C=this._getRangeToRender(),R=C[0],T=C[1],O=[];if(u>0)for(var z=R;z<=T;z++)O.push(e.createElement(o,{data:d,key:m(z,d),index:z,isScrolling:I?M:void 0,style:this._getItemStyle(z)}));var b=f(this.props,this._instanceProps);return e.createElement(g||v||"div",{className:n,onScroll:_,ref:this._outerRefSetter,style:r({position:"relative",height:a,width:w,overflow:"auto",WebkitOverflowScrolling:"touch",willChange:"transform",direction:i},S)},e.createElement(s||c||"div",{children:O,ref:l,style:{height:x?"100%":b,pointerEvents:M?"none":void 0,width:x?b:"100%"}}))},l._callPropsCallbacks=function(){if("function"==typeof this.props.onItemsRendered&&this.props.itemCount>0){var t=this._getRangeToRender(),e=t[0],r=t[1],o=t[2],n=t[3];this._callOnItemsRendered(e,r,o,n)}if("function"==typeof this.props.onScroll){var i=this.state,a=i.scrollDirection,l=i.scrollOffset,s=i.scrollUpdateWasRequested;this._callOnScroll(a,l,s)}},l._getRangeToRender=function(){var t=this.props,e=t.itemCount,r=t.overscanCount,o=this.state,n=o.isScrolling,i=o.scrollDirection,a=o.scrollOffset;if(0===e)return[0,0,0,0];var l=p(this.props,a,this._instanceProps),s=g(this.props,l,a,this._instanceProps),c=n&&"backward"!==i?1:Math.max(1,r),u=n&&"forward"!==i?1:Math.max(1,r);return[Math.max(0,l-c),Math.max(0,Math.min(e-1,s+u)),l,s]},i}(e.PureComponent),i.defaultProps={direction:"ltr",itemData:void 0,layout:"vertical",overscanCount:2,useIsScrolling:!1},l}var O=function(t,e){t.children,t.direction,t.height,t.layout,t.innerTagName,t.outerTagName,t.width,e.instance},z=function(t,e,r){var o=t.itemSize,n=r.itemMetadataMap,i=r.lastMeasuredIndex;if(e>i){var a=0;if(i>=0){var l=n[i];a=l.offset+l.size}for(var s=i+1;s<=e;s++){var c=o(s);n[s]={offset:a,size:c},a+=c}r.lastMeasuredIndex=e}return n[e]},b=function(t,e,r,o,n){for(;o<=r;){var i=o+Math.floor((r-o)/2),a=z(t,i,e).offset;if(a===n)return i;a<n?o=i+1:a>n&&(r=i-1)}return o>0?o-1:0},P=function(t,e,r,o){for(var n=t.itemCount,i=1;r<n&&z(t,r,e).offset<o;)r+=i,i*=2;return b(t,e,Math.min(r,n-1),Math.floor(r/2),o)},W=function(t,e){var r=t.itemCount,o=e.itemMetadataMap,n=e.estimatedItemSize,i=e.lastMeasuredIndex,a=0;if(i>=r&&(i=r-1),i>=0){var l=o[i];a=l.offset+l.size}return a+(r-i-1)*n},D=T({getItemOffset:function(t,e,r){return z(t,e,r).offset},getItemSize:function(t,e,r){return r.itemMetadataMap[e].size},getEstimatedTotalSize:W,getOffsetForIndexAndAlignment:function(t,e,r,o,n){var i=t.direction,a=t.height,l=t.layout,s=t.width,c="horizontal"===i||"horizontal"===l?s:a,u=z(t,e,n),f=W(t,n),d=Math.max(0,Math.min(f-c,u.offset)),h=Math.max(0,u.offset-c+u.size);switch("smart"===r&&(r=o>=h-c&&o<=d+c?"auto":"center"),r){case"start":return d;case"end":return h;case"center":return Math.round(h+(d-h)/2);case"auto":default:return o>=h&&o<=d?o:o<h?h:d}},getStartIndexForOffset:function(t,e,r){return function(t,e,r){var o=e.itemMetadataMap,n=e.lastMeasuredIndex;return(n>0?o[n].offset:0)>=r?b(t,e,n,0,r):P(t,e,Math.max(0,n),r)}(t,r,e)},getStopIndexForStartIndex:function(t,e,r,o){for(var n=t.direction,i=t.height,a=t.itemCount,l=t.layout,s=t.width,c="horizontal"===n||"horizontal"===l?s:i,u=z(t,e,o),f=r+c,d=u.offset+u.size,h=e;h<a-1&&d<f;)d+=z(t,++h,o).size;return h},initInstanceProps:function(t,e){var r={itemMetadataMap:{},estimatedItemSize:t.estimatedItemSize||50,lastMeasuredIndex:-1};return e.resetAfterIndex=function(t,o){void 0===o&&(o=!0),r.lastMeasuredIndex=Math.min(r.lastMeasuredIndex,t-1),e._getItemStyleCache(-1),o&&e.forceUpdate()},r},shouldResetStyleCacheOnItemSizeChange:!1,validateProps:function(t){t.itemSize}}),F=p({getColumnOffset:function(t,e){return e*t.columnWidth},getColumnWidth:function(t,e){return t.columnWidth},getRowOffset:function(t,e){return e*t.rowHeight},getRowHeight:function(t,e){return t.rowHeight},getEstimatedTotalHeight:function(t){var e=t.rowCount;return t.rowHeight*e},getEstimatedTotalWidth:function(t){var e=t.columnCount;return t.columnWidth*e},getOffsetForColumnAndAlignment:function(t,e,r,o,n,i){var a=t.columnCount,l=t.columnWidth,s=t.width,c=Math.max(0,a*l-s),u=Math.min(c,e*l),f=Math.max(0,e*l-s+i+l);switch("smart"===r&&(r=o>=f-s&&o<=u+s?"auto":"center"),r){case"start":return u;case"end":return f;case"center":var d=Math.round(f+(u-f)/2);return d<Math.ceil(s/2)?0:d>c+Math.floor(s/2)?c:d;case"auto":default:return o>=f&&o<=u?o:f>u?f:o<f?f:u}},getOffsetForRowAndAlignment:function(t,e,r,o,n,i){var a=t.rowHeight,l=t.height,s=t.rowCount,c=Math.max(0,s*a-l),u=Math.min(c,e*a),f=Math.max(0,e*a-l+i+a);switch("smart"===r&&(r=o>=f-l&&o<=u+l?"auto":"center"),r){case"start":return u;case"end":return f;case"center":var d=Math.round(f+(u-f)/2);return d<Math.ceil(l/2)?0:d>c+Math.floor(l/2)?c:d;case"auto":default:return o>=f&&o<=u?o:f>u?f:o<f?f:u}},getColumnStartIndexForOffset:function(t,e){var r=t.columnWidth,o=t.columnCount;return Math.max(0,Math.min(o-1,Math.floor(e/r)))},getColumnStopIndexForStartIndex:function(t,e,r){var o=t.columnWidth,n=t.columnCount,i=t.width,a=e*o,l=Math.ceil((i+r-a)/o);return Math.max(0,Math.min(n-1,e+l-1))},getRowStartIndexForOffset:function(t,e){var r=t.rowHeight,o=t.rowCount;return Math.max(0,Math.min(o-1,Math.floor(e/r)))},getRowStopIndexForStartIndex:function(t,e,r){var o=t.rowHeight,n=t.rowCount,i=t.height,a=e*o,l=Math.ceil((i+r-a)/o);return Math.max(0,Math.min(n-1,e+l-1))},initInstanceProps:function(t){},shouldResetStyleCacheOnItemSizeChange:!0,validateProps:function(t){t.columnWidth,t.rowHeight}}),L=T({getItemOffset:function(t,e){return e*t.itemSize},getItemSize:function(t,e){return t.itemSize},getEstimatedTotalSize:function(t){var e=t.itemCount;return t.itemSize*e},getOffsetForIndexAndAlignment:function(t,e,r,o){var n=t.direction,i=t.height,a=t.itemCount,l=t.itemSize,s=t.layout,c=t.width,u="horizontal"===n||"horizontal"===s?c:i,f=Math.max(0,a*l-u),d=Math.min(f,e*l),h=Math.max(0,e*l-u+l);switch("smart"===r&&(r=o>=h-u&&o<=d+u?"auto":"center"),r){case"start":return d;case"end":return h;case"center":var m=Math.round(h+(d-h)/2);return m<Math.ceil(u/2)?0:m>f+Math.floor(u/2)?f:m;case"auto":default:return o>=h&&o<=d?o:o<h?h:d}},getStartIndexForOffset:function(t,e){var r=t.itemCount,o=t.itemSize;return Math.max(0,Math.min(r-1,Math.floor(e/o)))},getStopIndexForStartIndex:function(t,e,r){var o=t.direction,n=t.height,i=t.itemCount,a=t.itemSize,l=t.layout,s=t.width,c=e*a,u="horizontal"===o||"horizontal"===l?s:n,f=Math.ceil((u+r-c)/a);return Math.max(0,Math.min(i-1,e+f-1))},initInstanceProps:function(t){},shouldResetStyleCacheOnItemSizeChange:!0,validateProps:function(t){t.itemSize}});function A(t,e){if(null==t)return{};var r,o,n={},i=Object.keys(t);for(o=0;o<i.length;o++)r=i[o],e.indexOf(r)>=0||(n[r]=t[r]);return n}function H(t,e){for(var r in t)if(!(r in e))return!0;for(var o in e)if(t[o]!==e[o])return!0;return!1}function k(t,e){var r=t.style,o=A(t,["style"]),n=e.style,i=A(e,["style"]);return!H(r,n)&&!H(o,i)}t.VariableSizeGrid=C,t.VariableSizeList=D,t.FixedSizeGrid=F,t.FixedSizeList=L,t.areEqual=k,t.shouldComponentUpdate=function(t,e){return!k(this.props,t)||H(this.state,e)},Object.defineProperty(t,"__esModule",{value:!0})});
+//# sourceMappingURL=index-prod.umd.js.map
diff --git a/vendor/react-window/dist/index.cjs.js b/vendor/react-window/dist/index.cjs.js
index 08582cdb6fc5d..83875b5ee0193 100644
--- a/vendor/react-window/dist/index.cjs.js
+++ b/vendor/react-window/dist/index.cjs.js
@@ -59,6 +59,50 @@ function getScrollbarSize(recalculate) {
 
   return size;
 }
+var cachedRTLResult = null; // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+// Chrome does not seem to adhere; its scrollLeft values are positive (measured relative to the left).
+// Safari's elastic bounce makes detecting this even more complicated wrt potential false positives.
+// The safest way to check this is to intentionally set a negative offset,
+// and then verify that the subsequent "scroll" event matches the negative offset.
+// If it does not match, then we can assume a non-standard RTL scroll implementation.
+
+function getRTLOffsetType(recalculate) {
+  if (recalculate === void 0) {
+    recalculate = false;
+  }
+
+  if (cachedRTLResult === null || recalculate) {
+    var outerDiv = document.createElement('div');
+    var outerStyle = outerDiv.style;
+    outerStyle.width = '50px';
+    outerStyle.height = '50px';
+    outerStyle.overflow = 'scroll';
+    outerStyle.direction = 'rtl';
+    var innerDiv = document.createElement('div');
+    var innerStyle = innerDiv.style;
+    innerStyle.width = '100px';
+    innerStyle.height = '100px';
+    outerDiv.appendChild(innerDiv);
+    document.body.appendChild(outerDiv);
+
+    if (outerDiv.scrollLeft > 0) {
+      cachedRTLResult = 'positive-descending';
+    } else {
+      outerDiv.scrollLeft = 1;
+
+      if (outerDiv.scrollLeft === 0) {
+        cachedRTLResult = 'negative';
+      } else {
+        cachedRTLResult = 'positive-ascending';
+      }
+    }
+
+    document.body.removeChild(outerDiv);
+    return cachedRTLResult;
+  }
+
+  return cachedRTLResult;
+}
 
 var IS_SCROLLING_DEBOUNCE_INTERVAL = 150;
 
@@ -72,6 +116,7 @@ var defaultItemKey = function defaultItemKey(_ref) {
 
 
 var devWarningsOverscanCount = null;
+var devWarningsOverscanRowsColumnsCount = null;
 var devWarningsTagName = null;
 
 if (process.env.NODE_ENV !== 'production') {
@@ -79,6 +124,9 @@ if (process.env.NODE_ENV !== 'production') {
     devWarningsOverscanCount =
     /*#__PURE__*/
     new WeakSet();
+    devWarningsOverscanRowsColumnsCount =
+    /*#__PURE__*/
+    new WeakSet();
     devWarningsTagName =
     /*#__PURE__*/
     new WeakSet();
@@ -183,9 +231,11 @@ function createGridComponent(_ref2) {
 
       _this._onScroll = function (event) {
         var _event$currentTarget = event.currentTarget,
+            clientHeight = _event$currentTarget.clientHeight,
             clientWidth = _event$currentTarget.clientWidth,
             scrollLeft = _event$currentTarget.scrollLeft,
             scrollTop = _event$currentTarget.scrollTop,
+            scrollHeight = _event$currentTarget.scrollHeight,
             scrollWidth = _event$currentTarget.scrollWidth;
 
         _this.setState(function (prevState) {
@@ -196,25 +246,33 @@ function createGridComponent(_ref2) {
             return null;
           }
 
-          var direction = _this.props.direction; // HACK According to the spec, scrollLeft should be negative for RTL aligned elements.
-          // Chrome does not seem to adhere; its scrollLeft values are positive (measured relative to the left).
-          // See https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft
+          var direction = _this.props.direction; // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+          // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+          // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.
+          // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.
 
           var calculatedScrollLeft = scrollLeft;
 
           if (direction === 'rtl') {
-            if (scrollLeft <= 0) {
-              calculatedScrollLeft = -scrollLeft;
-            } else {
-              calculatedScrollLeft = scrollWidth - clientWidth - scrollLeft;
+            switch (getRTLOffsetType()) {
+              case 'negative':
+                calculatedScrollLeft = -scrollLeft;
+                break;
+
+              case 'positive-descending':
+                calculatedScrollLeft = scrollWidth - clientWidth - scrollLeft;
+                break;
             }
-          }
+          } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
+
 
+          calculatedScrollLeft = Math.max(0, Math.min(calculatedScrollLeft, scrollWidth - clientWidth));
+          var calculatedScrollTop = Math.max(0, Math.min(scrollTop, scrollHeight - clientHeight));
           return {
             isScrolling: true,
             horizontalScrollDirection: prevState.scrollLeft < scrollLeft ? 'forward' : 'backward',
             scrollLeft: calculatedScrollLeft,
-            scrollTop: scrollTop,
+            scrollTop: calculatedScrollTop,
             verticalScrollDirection: prevState.scrollTop < scrollTop ? 'forward' : 'backward',
             scrollUpdateWasRequested: false
           };
@@ -339,26 +397,55 @@ function createGridComponent(_ref2) {
           initialScrollLeft = _this$props3.initialScrollLeft,
           initialScrollTop = _this$props3.initialScrollTop;
 
-      if (typeof initialScrollLeft === 'number' && this._outerRef != null) {
-        this._outerRef.scrollLeft = initialScrollLeft;
-      }
+      if (this._outerRef != null) {
+        var outerRef = this._outerRef;
+
+        if (typeof initialScrollLeft === 'number') {
+          outerRef.scrollLeft = initialScrollLeft;
+        }
 
-      if (typeof initialScrollTop === 'number' && this._outerRef != null) {
-        this._outerRef.scrollTop = initialScrollTop;
+        if (typeof initialScrollTop === 'number') {
+          outerRef.scrollTop = initialScrollTop;
+        }
       }
 
       this._callPropsCallbacks();
     };
 
     _proto.componentDidUpdate = function componentDidUpdate() {
+      var direction = this.props.direction;
       var _this$state2 = this.state,
           scrollLeft = _this$state2.scrollLeft,
           scrollTop = _this$state2.scrollTop,
           scrollUpdateWasRequested = _this$state2.scrollUpdateWasRequested;
 
-      if (scrollUpdateWasRequested && this._outerRef !== null) {
-        this._outerRef.scrollLeft = scrollLeft;
-        this._outerRef.scrollTop = scrollTop;
+      if (scrollUpdateWasRequested && this._outerRef != null) {
+        // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+        // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+        // So we need to determine which browser behavior we're dealing with, and mimic it.
+        var outerRef = this._outerRef;
+
+        if (direction === 'rtl') {
+          switch (getRTLOffsetType()) {
+            case 'negative':
+              outerRef.scrollLeft = -scrollLeft;
+              break;
+
+            case 'positive-ascending':
+              outerRef.scrollLeft = scrollLeft;
+              break;
+
+            default:
+              var clientWidth = outerRef.clientWidth,
+                  scrollWidth = outerRef.scrollWidth;
+              outerRef.scrollLeft = scrollWidth - clientWidth - scrollLeft;
+              break;
+          }
+        } else {
+          outerRef.scrollLeft = Math.max(0, scrollLeft);
+        }
+
+        outerRef.scrollTop = Math.max(0, scrollTop);
       }
 
       this._callPropsCallbacks();
@@ -442,7 +529,7 @@ function createGridComponent(_ref2) {
         ref: innerRef,
         style: {
           height: estimatedTotalHeight,
-          pointerEvents: isScrolling ? 'none' : '',
+          pointerEvents: isScrolling ? 'none' : undefined,
           width: estimatedTotalWidth
         }
       }));
@@ -492,6 +579,7 @@ function createGridComponent(_ref2) {
     _proto._getHorizontalRangeToRender = function _getHorizontalRangeToRender() {
       var _this$props6 = this.props,
           columnCount = _this$props6.columnCount,
+          overscanColumnCount = _this$props6.overscanColumnCount,
           overscanColumnsCount = _this$props6.overscanColumnsCount,
           overscanCount = _this$props6.overscanCount,
           rowCount = _this$props6.rowCount;
@@ -499,7 +587,7 @@ function createGridComponent(_ref2) {
           horizontalScrollDirection = _this$state4.horizontalScrollDirection,
           isScrolling = _this$state4.isScrolling,
           scrollLeft = _this$state4.scrollLeft;
-      var overscanCountResolved = overscanColumnsCount || overscanCount || 1;
+      var overscanCountResolved = overscanColumnCount || overscanColumnsCount || overscanCount || 1;
 
       if (columnCount === 0 || rowCount === 0) {
         return [0, 0, 0, 0];
@@ -518,13 +606,14 @@ function createGridComponent(_ref2) {
       var _this$props7 = this.props,
           columnCount = _this$props7.columnCount,
           overscanCount = _this$props7.overscanCount,
+          overscanRowCount = _this$props7.overscanRowCount,
           overscanRowsCount = _this$props7.overscanRowsCount,
           rowCount = _this$props7.rowCount;
       var _this$state5 = this.state,
           isScrolling = _this$state5.isScrolling,
           verticalScrollDirection = _this$state5.verticalScrollDirection,
           scrollTop = _this$state5.scrollTop;
-      var overscanCountResolved = overscanRowsCount || overscanCount || 1;
+      var overscanCountResolved = overscanRowCount || overscanRowsCount || overscanCount || 1;
 
       if (columnCount === 0 || rowCount === 0) {
         return [0, 0, 0, 0];
@@ -553,7 +642,9 @@ var validateSharedProps = function validateSharedProps(_ref5, _ref6) {
       height = _ref5.height,
       innerTagName = _ref5.innerTagName,
       outerTagName = _ref5.outerTagName,
+      overscanColumnsCount = _ref5.overscanColumnsCount,
       overscanCount = _ref5.overscanCount,
+      overscanRowsCount = _ref5.overscanRowsCount,
       width = _ref5.width;
   var instance = _ref6.instance;
 
@@ -561,7 +652,14 @@ var validateSharedProps = function validateSharedProps(_ref5, _ref6) {
     if (typeof overscanCount === 'number') {
       if (devWarningsOverscanCount && !devWarningsOverscanCount.has(instance)) {
         devWarningsOverscanCount.add(instance);
-        console.warn('The overscanCount prop has been deprecated. ' + 'Please use the overscanColumnsCount and overscanRowsCount props instead.');
+        console.warn('The overscanCount prop has been deprecated. ' + 'Please use the overscanColumnCount and overscanRowCount props instead.');
+      }
+    }
+
+    if (typeof overscanColumnsCount === 'number' || typeof overscanRowsCount === 'number') {
+      if (devWarningsOverscanRowsColumnsCount && !devWarningsOverscanRowsColumnsCount.has(instance)) {
+        devWarningsOverscanRowsColumnsCount.add(instance);
+        console.warn('The overscanColumnsCount and overscanRowsCount props have been deprecated. ' + 'Please use the overscanColumnCount and overscanRowCount props instead.');
       }
     }
 
@@ -770,7 +868,11 @@ var getOffsetForIndexAndAlignment = function getOffsetForIndexAndAlignment(itemT
     default:
       if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
         return scrollOffset;
-      } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+      } else if (minOffset > maxOffset) {
+        // Because we only take into account the scrollbar size when calculating minOffset
+        // this value can be larger than maxOffset when at the end of the list
+        return minOffset;
+      } else if (scrollOffset < minOffset) {
         return minOffset;
       } else {
         return maxOffset;
@@ -1037,20 +1139,27 @@ function createListComponent(_ref) {
             return null;
           }
 
-          var direction = _this.props.direction; // HACK According to the spec, scrollLeft should be negative for RTL aligned elements.
-          // Chrome does not seem to adhere; its scrolLeft values are positive (measured relative to the left).
-          // See https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft
-
+          var direction = _this.props.direction;
           var scrollOffset = scrollLeft;
 
           if (direction === 'rtl') {
-            if (scrollLeft <= 0) {
-              scrollOffset = -scrollOffset;
-            } else {
-              scrollOffset = scrollWidth - clientWidth - scrollLeft;
+            // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+            // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+            // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.
+            // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.
+            switch (getRTLOffsetType()) {
+              case 'negative':
+                scrollOffset = -scrollLeft;
+                break;
+
+              case 'positive-descending':
+                scrollOffset = scrollWidth - clientWidth - scrollLeft;
+                break;
             }
-          }
+          } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
+
 
+          scrollOffset = Math.max(0, Math.min(scrollOffset, scrollWidth - clientWidth));
           return {
             isScrolling: true,
             scrollDirection: prevState.scrollOffset < scrollLeft ? 'forward' : 'backward',
@@ -1061,7 +1170,10 @@ function createListComponent(_ref) {
       };
 
       _this._onScrollVertical = function (event) {
-        var scrollTop = event.currentTarget.scrollTop;
+        var _event$currentTarget2 = event.currentTarget,
+            clientHeight = _event$currentTarget2.clientHeight,
+            scrollHeight = _event$currentTarget2.scrollHeight,
+            scrollTop = _event$currentTarget2.scrollTop;
 
         _this.setState(function (prevState) {
           if (prevState.scrollOffset === scrollTop) {
@@ -1069,12 +1181,14 @@ function createListComponent(_ref) {
             // In which case we don't need to trigger another render,
             // And we don't want to update state.isScrolling.
             return null;
-          }
+          } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
 
+
+          var scrollOffset = Math.max(0, Math.min(scrollTop, scrollHeight - clientHeight));
           return {
             isScrolling: true,
-            scrollDirection: prevState.scrollOffset < scrollTop ? 'forward' : 'backward',
-            scrollOffset: scrollTop,
+            scrollDirection: prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',
+            scrollOffset: scrollOffset,
             scrollUpdateWasRequested: false
           };
         }, _this._resetIsScrollingDebounced);
@@ -1154,12 +1268,13 @@ function createListComponent(_ref) {
           initialScrollOffset = _this$props2.initialScrollOffset,
           layout = _this$props2.layout;
 
-      if (typeof initialScrollOffset === 'number' && this._outerRef !== null) {
-        // TODO Deprecate direction "horizontal"
+      if (typeof initialScrollOffset === 'number' && this._outerRef != null) {
+        var outerRef = this._outerRef; // TODO Deprecate direction "horizontal"
+
         if (direction === 'horizontal' || layout === 'horizontal') {
-          this._outerRef.scrollLeft = initialScrollOffset;
+          outerRef.scrollLeft = initialScrollOffset;
         } else {
-          this._outerRef.scrollTop = initialScrollOffset;
+          outerRef.scrollTop = initialScrollOffset;
         }
       }
 
@@ -1174,12 +1289,34 @@ function createListComponent(_ref) {
           scrollOffset = _this$state.scrollOffset,
           scrollUpdateWasRequested = _this$state.scrollUpdateWasRequested;
 
-      if (scrollUpdateWasRequested && this._outerRef !== null) {
-        // TODO Deprecate direction "horizontal"
+      if (scrollUpdateWasRequested && this._outerRef != null) {
+        var outerRef = this._outerRef; // TODO Deprecate direction "horizontal"
+
         if (direction === 'horizontal' || layout === 'horizontal') {
-          this._outerRef.scrollLeft = scrollOffset;
+          if (direction === 'rtl') {
+            // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+            // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+            // So we need to determine which browser behavior we're dealing with, and mimic it.
+            switch (getRTLOffsetType()) {
+              case 'negative':
+                outerRef.scrollLeft = -scrollOffset;
+                break;
+
+              case 'positive-ascending':
+                outerRef.scrollLeft = scrollOffset;
+                break;
+
+              default:
+                var clientWidth = outerRef.clientWidth,
+                    scrollWidth = outerRef.scrollWidth;
+                outerRef.scrollLeft = scrollWidth - clientWidth - scrollOffset;
+                break;
+            }
+          } else {
+            outerRef.scrollLeft = scrollOffset;
+          }
         } else {
-          this._outerRef.scrollTop = scrollOffset;
+          outerRef.scrollTop = scrollOffset;
         }
       }
 
@@ -1255,7 +1392,7 @@ function createListComponent(_ref) {
         ref: innerRef,
         style: {
           height: isHorizontal ? '100%' : estimatedTotalSize,
-          pointerEvents: isScrolling ? 'none' : '',
+          pointerEvents: isScrolling ? 'none' : undefined,
           width: isHorizontal ? estimatedTotalSize : '100%'
         }
       }));
@@ -1537,7 +1674,7 @@ createListComponent({
       default:
         if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
           return scrollOffset;
-        } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+        } else if (scrollOffset < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -1642,7 +1779,8 @@ createGridComponent({
     var columnCount = _ref7.columnCount,
         columnWidth = _ref7.columnWidth,
         width = _ref7.width;
-    var maxOffset = Math.max(0, Math.min(columnCount * columnWidth - width, columnIndex * columnWidth));
+    var lastColumnOffset = Math.max(0, columnCount * columnWidth - width);
+    var maxOffset = Math.min(lastColumnOffset, columnIndex * columnWidth);
     var minOffset = Math.max(0, columnIndex * columnWidth - width + scrollbarSize + columnWidth);
 
     if (align === 'smart') {
@@ -1661,13 +1799,27 @@ createGridComponent({
         return minOffset;
 
       case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+        // "Centered" offset is usually the average of the min and max.
+        // But near the edges of the list, this doesn't hold true.
+        var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);
+
+        if (middleOffset < Math.ceil(width / 2)) {
+          return 0; // near the beginning
+        } else if (middleOffset > lastColumnOffset + Math.floor(width / 2)) {
+          return lastColumnOffset; // near the end
+        } else {
+          return middleOffset;
+        }
 
       case 'auto':
       default:
         if (scrollLeft >= minOffset && scrollLeft <= maxOffset) {
           return scrollLeft;
-        } else if (scrollLeft - minOffset < maxOffset - scrollLeft) {
+        } else if (minOffset > maxOffset) {
+          // Because we only take into account the scrollbar size when calculating minOffset
+          // this value can be larger than maxOffset when at the end of the list
+          return minOffset;
+        } else if (scrollLeft < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -1679,7 +1831,8 @@ createGridComponent({
     var rowHeight = _ref8.rowHeight,
         height = _ref8.height,
         rowCount = _ref8.rowCount;
-    var maxOffset = Math.max(0, Math.min(rowCount * rowHeight - height, rowIndex * rowHeight));
+    var lastRowOffset = Math.max(0, rowCount * rowHeight - height);
+    var maxOffset = Math.min(lastRowOffset, rowIndex * rowHeight);
     var minOffset = Math.max(0, rowIndex * rowHeight - height + scrollbarSize + rowHeight);
 
     if (align === 'smart') {
@@ -1698,13 +1851,27 @@ createGridComponent({
         return minOffset;
 
       case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+        // "Centered" offset is usually the average of the min and max.
+        // But near the edges of the list, this doesn't hold true.
+        var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);
+
+        if (middleOffset < Math.ceil(height / 2)) {
+          return 0; // near the beginning
+        } else if (middleOffset > lastRowOffset + Math.floor(height / 2)) {
+          return lastRowOffset; // near the end
+        } else {
+          return middleOffset;
+        }
 
       case 'auto':
       default:
         if (scrollTop >= minOffset && scrollTop <= maxOffset) {
           return scrollTop;
-        } else if (scrollTop - minOffset < maxOffset - scrollTop) {
+        } else if (minOffset > maxOffset) {
+          // Because we only take into account the scrollbar size when calculating minOffset
+          // this value can be larger than maxOffset when at the end of the list
+          return minOffset;
+        } else if (scrollTop < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -1722,7 +1889,9 @@ createGridComponent({
         columnCount = _ref10.columnCount,
         width = _ref10.width;
     var left = startIndex * columnWidth;
-    return Math.max(0, Math.min(columnCount - 1, startIndex + Math.floor((width + (scrollLeft - left)) / columnWidth)));
+    var numVisibleColumns = Math.ceil((width + scrollLeft - left) / columnWidth);
+    return Math.max(0, Math.min(columnCount - 1, startIndex + numVisibleColumns - 1 // -1 is because stop index is inclusive
+    ));
   },
   getRowStartIndexForOffset: function getRowStartIndexForOffset(_ref11, scrollTop) {
     var rowHeight = _ref11.rowHeight,
@@ -1733,8 +1902,10 @@ createGridComponent({
     var rowHeight = _ref12.rowHeight,
         rowCount = _ref12.rowCount,
         height = _ref12.height;
-    var left = startIndex * rowHeight;
-    return Math.max(0, Math.min(rowCount - 1, startIndex + Math.floor((height + (scrollTop - left)) / rowHeight)));
+    var top = startIndex * rowHeight;
+    var numVisibleRows = Math.ceil((height + scrollTop - top) / rowHeight);
+    return Math.max(0, Math.min(rowCount - 1, startIndex + numVisibleRows - 1 // -1 is because stop index is inclusive
+    ));
   },
   initInstanceProps: function initInstanceProps(props) {// Noop
   },
@@ -1759,13 +1930,11 @@ var FixedSizeList =
 /*#__PURE__*/
 createListComponent({
   getItemOffset: function getItemOffset(_ref, index) {
-    var itemSize = _ref.itemSize,
-        size = _ref.size;
+    var itemSize = _ref.itemSize;
     return index * itemSize;
   },
   getItemSize: function getItemSize(_ref2, index) {
-    var itemSize = _ref2.itemSize,
-        size = _ref2.size;
+    var itemSize = _ref2.itemSize;
     return itemSize;
   },
   getEstimatedTotalSize: function getEstimatedTotalSize(_ref3) {
@@ -1783,7 +1952,8 @@ createListComponent({
     // TODO Deprecate direction "horizontal"
     var isHorizontal = direction === 'horizontal' || layout === 'horizontal';
     var size = isHorizontal ? width : height;
-    var maxOffset = Math.max(0, Math.min(itemCount * itemSize - size, index * itemSize));
+    var lastItemOffset = Math.max(0, itemCount * itemSize - size);
+    var maxOffset = Math.min(lastItemOffset, index * itemSize);
     var minOffset = Math.max(0, index * itemSize - size + itemSize);
 
     if (align === 'smart') {
@@ -1802,13 +1972,25 @@ createListComponent({
         return minOffset;
 
       case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+        {
+          // "Centered" offset is usually the average of the min and max.
+          // But near the edges of the list, this doesn't hold true.
+          var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);
+
+          if (middleOffset < Math.ceil(size / 2)) {
+            return 0; // near the beginning
+          } else if (middleOffset > lastItemOffset + Math.floor(size / 2)) {
+            return lastItemOffset; // near the end
+          } else {
+            return middleOffset;
+          }
+        }
 
       case 'auto':
       default:
         if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
           return scrollOffset;
-        } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+        } else if (scrollOffset < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -1832,7 +2014,9 @@ createListComponent({
     var isHorizontal = direction === 'horizontal' || layout === 'horizontal';
     var offset = startIndex * itemSize;
     var size = isHorizontal ? width : height;
-    return Math.max(0, Math.min(itemCount - 1, startIndex + Math.floor((size + (scrollOffset - offset)) / itemSize)));
+    var numVisibleItems = Math.ceil((size + scrollOffset - offset) / itemSize);
+    return Math.max(0, Math.min(itemCount - 1, startIndex + numVisibleItems - 1 // -1 is because stop index is inclusive
+    ));
   },
   initInstanceProps: function initInstanceProps(props) {// Noop
   },
@@ -1892,3 +2076,4 @@ exports.FixedSizeGrid = FixedSizeGrid;
 exports.FixedSizeList = FixedSizeList;
 exports.areEqual = areEqual;
 exports.shouldComponentUpdate = shouldComponentUpdate;
+//# sourceMappingURL=index.cjs.js.map
diff --git a/vendor/react-window/dist/index.esm.js b/vendor/react-window/dist/index.esm.js
index 19b1884d12ca4..9cf49546c8916 100644
--- a/vendor/react-window/dist/index.esm.js
+++ b/vendor/react-window/dist/index.esm.js
@@ -54,6 +54,50 @@ function getScrollbarSize(recalculate) {
 
   return size;
 }
+var cachedRTLResult = null; // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+// Chrome does not seem to adhere; its scrollLeft values are positive (measured relative to the left).
+// Safari's elastic bounce makes detecting this even more complicated wrt potential false positives.
+// The safest way to check this is to intentionally set a negative offset,
+// and then verify that the subsequent "scroll" event matches the negative offset.
+// If it does not match, then we can assume a non-standard RTL scroll implementation.
+
+function getRTLOffsetType(recalculate) {
+  if (recalculate === void 0) {
+    recalculate = false;
+  }
+
+  if (cachedRTLResult === null || recalculate) {
+    var outerDiv = document.createElement('div');
+    var outerStyle = outerDiv.style;
+    outerStyle.width = '50px';
+    outerStyle.height = '50px';
+    outerStyle.overflow = 'scroll';
+    outerStyle.direction = 'rtl';
+    var innerDiv = document.createElement('div');
+    var innerStyle = innerDiv.style;
+    innerStyle.width = '100px';
+    innerStyle.height = '100px';
+    outerDiv.appendChild(innerDiv);
+    document.body.appendChild(outerDiv);
+
+    if (outerDiv.scrollLeft > 0) {
+      cachedRTLResult = 'positive-descending';
+    } else {
+      outerDiv.scrollLeft = 1;
+
+      if (outerDiv.scrollLeft === 0) {
+        cachedRTLResult = 'negative';
+      } else {
+        cachedRTLResult = 'positive-ascending';
+      }
+    }
+
+    document.body.removeChild(outerDiv);
+    return cachedRTLResult;
+  }
+
+  return cachedRTLResult;
+}
 
 var IS_SCROLLING_DEBOUNCE_INTERVAL = 150;
 
@@ -67,6 +111,7 @@ var defaultItemKey = function defaultItemKey(_ref) {
 
 
 var devWarningsOverscanCount = null;
+var devWarningsOverscanRowsColumnsCount = null;
 var devWarningsTagName = null;
 
 if (process.env.NODE_ENV !== 'production') {
@@ -74,6 +119,9 @@ if (process.env.NODE_ENV !== 'production') {
     devWarningsOverscanCount =
     /*#__PURE__*/
     new WeakSet();
+    devWarningsOverscanRowsColumnsCount =
+    /*#__PURE__*/
+    new WeakSet();
     devWarningsTagName =
     /*#__PURE__*/
     new WeakSet();
@@ -178,9 +226,11 @@ function createGridComponent(_ref2) {
 
       _this._onScroll = function (event) {
         var _event$currentTarget = event.currentTarget,
+            clientHeight = _event$currentTarget.clientHeight,
             clientWidth = _event$currentTarget.clientWidth,
             scrollLeft = _event$currentTarget.scrollLeft,
             scrollTop = _event$currentTarget.scrollTop,
+            scrollHeight = _event$currentTarget.scrollHeight,
             scrollWidth = _event$currentTarget.scrollWidth;
 
         // Force flush sync for scroll updates to reduce visual checkerboarding.
@@ -193,25 +243,33 @@ function createGridComponent(_ref2) {
               return null;
             }
 
-            var direction = _this.props.direction; // HACK According to the spec, scrollLeft should be negative for RTL aligned elements.
-            // Chrome does not seem to adhere; its scrollLeft values are positive (measured relative to the left).
-            // See https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft
+            var direction = _this.props.direction; // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+            // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+            // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.
+            // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.
 
             var calculatedScrollLeft = scrollLeft;
 
             if (direction === 'rtl') {
-              if (scrollLeft <= 0) {
-                calculatedScrollLeft = -scrollLeft;
-              } else {
-                calculatedScrollLeft = scrollWidth - clientWidth - scrollLeft;
+              switch (getRTLOffsetType()) {
+                case 'negative':
+                  calculatedScrollLeft = -scrollLeft;
+                  break;
+
+                case 'positive-descending':
+                  calculatedScrollLeft = scrollWidth - clientWidth - scrollLeft;
+                  break;
               }
-            }
+            } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
+
 
+            calculatedScrollLeft = Math.max(0, Math.min(calculatedScrollLeft, scrollWidth - clientWidth));
+            var calculatedScrollTop = Math.max(0, Math.min(scrollTop, scrollHeight - clientHeight));
             return {
               isScrolling: true,
               horizontalScrollDirection: prevState.scrollLeft < scrollLeft ? 'forward' : 'backward',
               scrollLeft: calculatedScrollLeft,
-              scrollTop: scrollTop,
+              scrollTop: calculatedScrollTop,
               verticalScrollDirection: prevState.scrollTop < scrollTop ? 'forward' : 'backward',
               scrollUpdateWasRequested: false
             };
@@ -337,26 +395,55 @@ function createGridComponent(_ref2) {
           initialScrollLeft = _this$props3.initialScrollLeft,
           initialScrollTop = _this$props3.initialScrollTop;
 
-      if (typeof initialScrollLeft === 'number' && this._outerRef != null) {
-        this._outerRef.scrollLeft = initialScrollLeft;
-      }
+      if (this._outerRef != null) {
+        var outerRef = this._outerRef;
 
-      if (typeof initialScrollTop === 'number' && this._outerRef != null) {
-        this._outerRef.scrollTop = initialScrollTop;
+        if (typeof initialScrollLeft === 'number') {
+          outerRef.scrollLeft = initialScrollLeft;
+        }
+
+        if (typeof initialScrollTop === 'number') {
+          outerRef.scrollTop = initialScrollTop;
+        }
       }
 
       this._callPropsCallbacks();
     };
 
     _proto.componentDidUpdate = function componentDidUpdate() {
+      var direction = this.props.direction;
       var _this$state2 = this.state,
           scrollLeft = _this$state2.scrollLeft,
           scrollTop = _this$state2.scrollTop,
           scrollUpdateWasRequested = _this$state2.scrollUpdateWasRequested;
 
-      if (scrollUpdateWasRequested && this._outerRef !== null) {
-        this._outerRef.scrollLeft = scrollLeft;
-        this._outerRef.scrollTop = scrollTop;
+      if (scrollUpdateWasRequested && this._outerRef != null) {
+        // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+        // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+        // So we need to determine which browser behavior we're dealing with, and mimic it.
+        var outerRef = this._outerRef;
+
+        if (direction === 'rtl') {
+          switch (getRTLOffsetType()) {
+            case 'negative':
+              outerRef.scrollLeft = -scrollLeft;
+              break;
+
+            case 'positive-ascending':
+              outerRef.scrollLeft = scrollLeft;
+              break;
+
+            default:
+              var clientWidth = outerRef.clientWidth,
+                  scrollWidth = outerRef.scrollWidth;
+              outerRef.scrollLeft = scrollWidth - clientWidth - scrollLeft;
+              break;
+          }
+        } else {
+          outerRef.scrollLeft = Math.max(0, scrollLeft);
+        }
+
+        outerRef.scrollTop = Math.max(0, scrollTop);
       }
 
       this._callPropsCallbacks();
@@ -440,7 +527,7 @@ function createGridComponent(_ref2) {
         ref: innerRef,
         style: {
           height: estimatedTotalHeight,
-          pointerEvents: isScrolling ? 'none' : '',
+          pointerEvents: isScrolling ? 'none' : undefined,
           width: estimatedTotalWidth
         }
       }));
@@ -490,6 +577,7 @@ function createGridComponent(_ref2) {
     _proto._getHorizontalRangeToRender = function _getHorizontalRangeToRender() {
       var _this$props6 = this.props,
           columnCount = _this$props6.columnCount,
+          overscanColumnCount = _this$props6.overscanColumnCount,
           overscanColumnsCount = _this$props6.overscanColumnsCount,
           overscanCount = _this$props6.overscanCount,
           rowCount = _this$props6.rowCount;
@@ -497,7 +585,7 @@ function createGridComponent(_ref2) {
           horizontalScrollDirection = _this$state4.horizontalScrollDirection,
           isScrolling = _this$state4.isScrolling,
           scrollLeft = _this$state4.scrollLeft;
-      var overscanCountResolved = overscanColumnsCount || overscanCount || 1;
+      var overscanCountResolved = overscanColumnCount || overscanColumnsCount || overscanCount || 1;
 
       if (columnCount === 0 || rowCount === 0) {
         return [0, 0, 0, 0];
@@ -516,13 +604,14 @@ function createGridComponent(_ref2) {
       var _this$props7 = this.props,
           columnCount = _this$props7.columnCount,
           overscanCount = _this$props7.overscanCount,
+          overscanRowCount = _this$props7.overscanRowCount,
           overscanRowsCount = _this$props7.overscanRowsCount,
           rowCount = _this$props7.rowCount;
       var _this$state5 = this.state,
           isScrolling = _this$state5.isScrolling,
           verticalScrollDirection = _this$state5.verticalScrollDirection,
           scrollTop = _this$state5.scrollTop;
-      var overscanCountResolved = overscanRowsCount || overscanCount || 1;
+      var overscanCountResolved = overscanRowCount || overscanRowsCount || overscanCount || 1;
 
       if (columnCount === 0 || rowCount === 0) {
         return [0, 0, 0, 0];
@@ -551,7 +640,9 @@ var validateSharedProps = function validateSharedProps(_ref5, _ref6) {
       height = _ref5.height,
       innerTagName = _ref5.innerTagName,
       outerTagName = _ref5.outerTagName,
+      overscanColumnsCount = _ref5.overscanColumnsCount,
       overscanCount = _ref5.overscanCount,
+      overscanRowsCount = _ref5.overscanRowsCount,
       width = _ref5.width;
   var instance = _ref6.instance;
 
@@ -559,7 +650,14 @@ var validateSharedProps = function validateSharedProps(_ref5, _ref6) {
     if (typeof overscanCount === 'number') {
       if (devWarningsOverscanCount && !devWarningsOverscanCount.has(instance)) {
         devWarningsOverscanCount.add(instance);
-        console.warn('The overscanCount prop has been deprecated. ' + 'Please use the overscanColumnsCount and overscanRowsCount props instead.');
+        console.warn('The overscanCount prop has been deprecated. ' + 'Please use the overscanColumnCount and overscanRowCount props instead.');
+      }
+    }
+
+    if (typeof overscanColumnsCount === 'number' || typeof overscanRowsCount === 'number') {
+      if (devWarningsOverscanRowsColumnsCount && !devWarningsOverscanRowsColumnsCount.has(instance)) {
+        devWarningsOverscanRowsColumnsCount.add(instance);
+        console.warn('The overscanColumnsCount and overscanRowsCount props have been deprecated. ' + 'Please use the overscanColumnCount and overscanRowCount props instead.');
       }
     }
 
@@ -768,7 +866,11 @@ var getOffsetForIndexAndAlignment = function getOffsetForIndexAndAlignment(itemT
     default:
       if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
         return scrollOffset;
-      } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+      } else if (minOffset > maxOffset) {
+        // Because we only take into account the scrollbar size when calculating minOffset
+        // this value can be larger than maxOffset when at the end of the list
+        return minOffset;
+      } else if (scrollOffset < minOffset) {
         return minOffset;
       } else {
         return maxOffset;
@@ -1037,20 +1139,27 @@ function createListComponent(_ref) {
               return null;
             }
 
-            var direction = _this.props.direction; // HACK According to the spec, scrollLeft should be negative for RTL aligned elements.
-            // Chrome does not seem to adhere; its scrolLeft values are positive (measured relative to the left).
-            // See https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft
-
+            var direction = _this.props.direction;
             var scrollOffset = scrollLeft;
 
             if (direction === 'rtl') {
-              if (scrollLeft <= 0) {
-                scrollOffset = -scrollOffset;
-              } else {
-                scrollOffset = scrollWidth - clientWidth - scrollLeft;
+              // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+              // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+              // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.
+              // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.
+              switch (getRTLOffsetType()) {
+                case 'negative':
+                  scrollOffset = -scrollLeft;
+                  break;
+
+                case 'positive-descending':
+                  scrollOffset = scrollWidth - clientWidth - scrollLeft;
+                  break;
               }
-            }
+            } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
 
+
+            scrollOffset = Math.max(0, Math.min(scrollOffset, scrollWidth - clientWidth));
             return {
               isScrolling: true,
               scrollDirection: prevState.scrollOffset < scrollLeft ? 'forward' : 'backward',
@@ -1058,11 +1167,14 @@ function createListComponent(_ref) {
               scrollUpdateWasRequested: false
             };
           }, _this._resetIsScrollingDebounced);
-        });
-      };
+        };
+      });
 
       _this._onScrollVertical = function (event) {
-        var scrollTop = event.currentTarget.scrollTop;
+        var _event$currentTarget2 = event.currentTarget,
+            clientHeight = _event$currentTarget2.clientHeight,
+            scrollHeight = _event$currentTarget2.scrollHeight,
+            scrollTop = _event$currentTarget2.scrollTop;
 
         // Force flush sync for scroll updates to reduce visual checkerboarding.
         flushSync(() => {
@@ -1072,17 +1184,19 @@ function createListComponent(_ref) {
               // In which case we don't need to trigger another render,
               // And we don't want to update state.isScrolling.
               return null;
-            }
+            } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
 
+
+            var scrollOffset = Math.max(0, Math.min(scrollTop, scrollHeight - clientHeight));
             return {
               isScrolling: true,
-              scrollDirection: prevState.scrollOffset < scrollTop ? 'forward' : 'backward',
-              scrollOffset: scrollTop,
+              scrollDirection: prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',
+              scrollOffset: scrollOffset,
               scrollUpdateWasRequested: false
             };
           }, _this._resetIsScrollingDebounced);
-        });
-      };
+        };
+      });
 
       _this._outerRefSetter = function (ref) {
         var outerRef = _this.props.outerRef;
@@ -1158,12 +1272,13 @@ function createListComponent(_ref) {
           initialScrollOffset = _this$props2.initialScrollOffset,
           layout = _this$props2.layout;
 
-      if (typeof initialScrollOffset === 'number' && this._outerRef !== null) {
-        // TODO Deprecate direction "horizontal"
+      if (typeof initialScrollOffset === 'number' && this._outerRef != null) {
+        var outerRef = this._outerRef; // TODO Deprecate direction "horizontal"
+
         if (direction === 'horizontal' || layout === 'horizontal') {
-          this._outerRef.scrollLeft = initialScrollOffset;
+          outerRef.scrollLeft = initialScrollOffset;
         } else {
-          this._outerRef.scrollTop = initialScrollOffset;
+          outerRef.scrollTop = initialScrollOffset;
         }
       }
 
@@ -1178,12 +1293,34 @@ function createListComponent(_ref) {
           scrollOffset = _this$state.scrollOffset,
           scrollUpdateWasRequested = _this$state.scrollUpdateWasRequested;
 
-      if (scrollUpdateWasRequested && this._outerRef !== null) {
-        // TODO Deprecate direction "horizontal"
+      if (scrollUpdateWasRequested && this._outerRef != null) {
+        var outerRef = this._outerRef; // TODO Deprecate direction "horizontal"
+
         if (direction === 'horizontal' || layout === 'horizontal') {
-          this._outerRef.scrollLeft = scrollOffset;
+          if (direction === 'rtl') {
+            // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+            // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+            // So we need to determine which browser behavior we're dealing with, and mimic it.
+            switch (getRTLOffsetType()) {
+              case 'negative':
+                outerRef.scrollLeft = -scrollOffset;
+                break;
+
+              case 'positive-ascending':
+                outerRef.scrollLeft = scrollOffset;
+                break;
+
+              default:
+                var clientWidth = outerRef.clientWidth,
+                    scrollWidth = outerRef.scrollWidth;
+                outerRef.scrollLeft = scrollWidth - clientWidth - scrollOffset;
+                break;
+            }
+          } else {
+            outerRef.scrollLeft = scrollOffset;
+          }
         } else {
-          this._outerRef.scrollTop = scrollOffset;
+          outerRef.scrollTop = scrollOffset;
         }
       }
 
@@ -1259,7 +1396,7 @@ function createListComponent(_ref) {
         ref: innerRef,
         style: {
           height: isHorizontal ? '100%' : estimatedTotalSize,
-          pointerEvents: isScrolling ? 'none' : '',
+          pointerEvents: isScrolling ? 'none' : undefined,
           width: isHorizontal ? estimatedTotalSize : '100%'
         }
       }));
@@ -1541,7 +1678,7 @@ createListComponent({
       default:
         if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
           return scrollOffset;
-        } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+        } else if (scrollOffset < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -1646,7 +1783,8 @@ createGridComponent({
     var columnCount = _ref7.columnCount,
         columnWidth = _ref7.columnWidth,
         width = _ref7.width;
-    var maxOffset = Math.max(0, Math.min(columnCount * columnWidth - width, columnIndex * columnWidth));
+    var lastColumnOffset = Math.max(0, columnCount * columnWidth - width);
+    var maxOffset = Math.min(lastColumnOffset, columnIndex * columnWidth);
     var minOffset = Math.max(0, columnIndex * columnWidth - width + scrollbarSize + columnWidth);
 
     if (align === 'smart') {
@@ -1665,13 +1803,27 @@ createGridComponent({
         return minOffset;
 
       case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+        // "Centered" offset is usually the average of the min and max.
+        // But near the edges of the list, this doesn't hold true.
+        var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);
+
+        if (middleOffset < Math.ceil(width / 2)) {
+          return 0; // near the beginning
+        } else if (middleOffset > lastColumnOffset + Math.floor(width / 2)) {
+          return lastColumnOffset; // near the end
+        } else {
+          return middleOffset;
+        }
 
       case 'auto':
       default:
         if (scrollLeft >= minOffset && scrollLeft <= maxOffset) {
           return scrollLeft;
-        } else if (scrollLeft - minOffset < maxOffset - scrollLeft) {
+        } else if (minOffset > maxOffset) {
+          // Because we only take into account the scrollbar size when calculating minOffset
+          // this value can be larger than maxOffset when at the end of the list
+          return minOffset;
+        } else if (scrollLeft < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -1683,7 +1835,8 @@ createGridComponent({
     var rowHeight = _ref8.rowHeight,
         height = _ref8.height,
         rowCount = _ref8.rowCount;
-    var maxOffset = Math.max(0, Math.min(rowCount * rowHeight - height, rowIndex * rowHeight));
+    var lastRowOffset = Math.max(0, rowCount * rowHeight - height);
+    var maxOffset = Math.min(lastRowOffset, rowIndex * rowHeight);
     var minOffset = Math.max(0, rowIndex * rowHeight - height + scrollbarSize + rowHeight);
 
     if (align === 'smart') {
@@ -1702,13 +1855,27 @@ createGridComponent({
         return minOffset;
 
       case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+        // "Centered" offset is usually the average of the min and max.
+        // But near the edges of the list, this doesn't hold true.
+        var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);
+
+        if (middleOffset < Math.ceil(height / 2)) {
+          return 0; // near the beginning
+        } else if (middleOffset > lastRowOffset + Math.floor(height / 2)) {
+          return lastRowOffset; // near the end
+        } else {
+          return middleOffset;
+        }
 
       case 'auto':
       default:
         if (scrollTop >= minOffset && scrollTop <= maxOffset) {
           return scrollTop;
-        } else if (scrollTop - minOffset < maxOffset - scrollTop) {
+        } else if (minOffset > maxOffset) {
+          // Because we only take into account the scrollbar size when calculating minOffset
+          // this value can be larger than maxOffset when at the end of the list
+          return minOffset;
+        } else if (scrollTop < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -1726,7 +1893,9 @@ createGridComponent({
         columnCount = _ref10.columnCount,
         width = _ref10.width;
     var left = startIndex * columnWidth;
-    return Math.max(0, Math.min(columnCount - 1, startIndex + Math.floor((width + (scrollLeft - left)) / columnWidth)));
+    var numVisibleColumns = Math.ceil((width + scrollLeft - left) / columnWidth);
+    return Math.max(0, Math.min(columnCount - 1, startIndex + numVisibleColumns - 1 // -1 is because stop index is inclusive
+    ));
   },
   getRowStartIndexForOffset: function getRowStartIndexForOffset(_ref11, scrollTop) {
     var rowHeight = _ref11.rowHeight,
@@ -1737,8 +1906,10 @@ createGridComponent({
     var rowHeight = _ref12.rowHeight,
         rowCount = _ref12.rowCount,
         height = _ref12.height;
-    var left = startIndex * rowHeight;
-    return Math.max(0, Math.min(rowCount - 1, startIndex + Math.floor((height + (scrollTop - left)) / rowHeight)));
+    var top = startIndex * rowHeight;
+    var numVisibleRows = Math.ceil((height + scrollTop - top) / rowHeight);
+    return Math.max(0, Math.min(rowCount - 1, startIndex + numVisibleRows - 1 // -1 is because stop index is inclusive
+    ));
   },
   initInstanceProps: function initInstanceProps(props) {// Noop
   },
@@ -1763,13 +1934,11 @@ var FixedSizeList =
 /*#__PURE__*/
 createListComponent({
   getItemOffset: function getItemOffset(_ref, index) {
-    var itemSize = _ref.itemSize,
-        size = _ref.size;
+    var itemSize = _ref.itemSize;
     return index * itemSize;
   },
   getItemSize: function getItemSize(_ref2, index) {
-    var itemSize = _ref2.itemSize,
-        size = _ref2.size;
+    var itemSize = _ref2.itemSize;
     return itemSize;
   },
   getEstimatedTotalSize: function getEstimatedTotalSize(_ref3) {
@@ -1787,7 +1956,8 @@ createListComponent({
     // TODO Deprecate direction "horizontal"
     var isHorizontal = direction === 'horizontal' || layout === 'horizontal';
     var size = isHorizontal ? width : height;
-    var maxOffset = Math.max(0, Math.min(itemCount * itemSize - size, index * itemSize));
+    var lastItemOffset = Math.max(0, itemCount * itemSize - size);
+    var maxOffset = Math.min(lastItemOffset, index * itemSize);
     var minOffset = Math.max(0, index * itemSize - size + itemSize);
 
     if (align === 'smart') {
@@ -1806,13 +1976,25 @@ createListComponent({
         return minOffset;
 
       case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+        {
+          // "Centered" offset is usually the average of the min and max.
+          // But near the edges of the list, this doesn't hold true.
+          var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);
+
+          if (middleOffset < Math.ceil(size / 2)) {
+            return 0; // near the beginning
+          } else if (middleOffset > lastItemOffset + Math.floor(size / 2)) {
+            return lastItemOffset; // near the end
+          } else {
+            return middleOffset;
+          }
+        }
 
       case 'auto':
       default:
         if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
           return scrollOffset;
-        } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+        } else if (scrollOffset < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -1836,7 +2018,9 @@ createListComponent({
     var isHorizontal = direction === 'horizontal' || layout === 'horizontal';
     var offset = startIndex * itemSize;
     var size = isHorizontal ? width : height;
-    return Math.max(0, Math.min(itemCount - 1, startIndex + Math.floor((size + (scrollOffset - offset)) / itemSize)));
+    var numVisibleItems = Math.ceil((size + scrollOffset - offset) / itemSize);
+    return Math.max(0, Math.min(itemCount - 1, startIndex + numVisibleItems - 1 // -1 is because stop index is inclusive
+    ));
   },
   initInstanceProps: function initInstanceProps(props) {// Noop
   },
@@ -1891,3 +2075,4 @@ function shouldComponentUpdate(nextProps, nextState) {
 }
 
 export { VariableSizeGrid, VariableSizeList, FixedSizeGrid, FixedSizeList, areEqual, shouldComponentUpdate };
+//# sourceMappingURL=index.esm.js.map
diff --git a/vendor/react-window/package.json b/vendor/react-window/package.json
index adaea80fdb37d..d10a25a04ffdc 100644
--- a/vendor/react-window/package.json
+++ b/vendor/react-window/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-window",
-  "version": "1.8.0",
+  "version": "1.8.5",
   "description":
     "React components for efficiently rendering large, scrollable lists and tabular data",
   "author":
@@ -91,7 +91,7 @@
     "eslint-plugin-promise": "^3.7.0",
     "eslint-plugin-react": "^7.7.0",
     "eslint-plugin-standard": "^3.0.1",
-    "flow-bin": "^0.80.0",
+    "flow-bin": "^0.103.0",
     "gh-pages": "^1.1.0",
     "lint-staged": "^7.0.5",
     "prettier": "^1.12.1",
@@ -103,6 +103,8 @@
     "rollup": "^1.4.1",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "^9.2.1",
-    "rollup-plugin-node-resolve": "^4.0.1"
+    "rollup-plugin-node-resolve": "^4.0.1",
+    "rollup-plugin-replace": "^2.2.0",
+    "rollup-plugin-terser": "^5.1.0"
   }
 }
diff --git a/vendor/react-window/src/FixedSizeGrid.js b/vendor/react-window/src/FixedSizeGrid.js
index 452536a9df4b3..685ad33478205 100644
--- a/vendor/react-window/src/FixedSizeGrid.js
+++ b/vendor/react-window/src/FixedSizeGrid.js
@@ -31,12 +31,13 @@ const FixedSizeGrid = createGridComponent({
     instanceProps: typeof undefined,
     scrollbarSize: number
   ): number => {
-    const maxOffset = Math.max(
+    const lastColumnOffset = Math.max(
       0,
-      Math.min(
-        columnCount * ((columnWidth: any): number) - width,
-        columnIndex * ((columnWidth: any): number)
-      )
+      columnCount * ((columnWidth: any): number) - width
+    );
+    const maxOffset = Math.min(
+      lastColumnOffset,
+      columnIndex * ((columnWidth: any): number)
     );
     const minOffset = Math.max(
       0,
@@ -60,12 +61,27 @@ const FixedSizeGrid = createGridComponent({
       case 'end':
         return minOffset;
       case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+        // "Centered" offset is usually the average of the min and max.
+        // But near the edges of the list, this doesn't hold true.
+        const middleOffset = Math.round(
+          minOffset + (maxOffset - minOffset) / 2
+        );
+        if (middleOffset < Math.ceil(width / 2)) {
+          return 0; // near the beginning
+        } else if (middleOffset > lastColumnOffset + Math.floor(width / 2)) {
+          return lastColumnOffset; // near the end
+        } else {
+          return middleOffset;
+        }
       case 'auto':
       default:
         if (scrollLeft >= minOffset && scrollLeft <= maxOffset) {
           return scrollLeft;
-        } else if (scrollLeft - minOffset < maxOffset - scrollLeft) {
+        } else if (minOffset > maxOffset) {
+          // Because we only take into account the scrollbar size when calculating minOffset
+          // this value can be larger than maxOffset when at the end of the list
+          return minOffset;
+        } else if (scrollLeft < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -81,12 +97,13 @@ const FixedSizeGrid = createGridComponent({
     instanceProps: typeof undefined,
     scrollbarSize: number
   ): number => {
-    const maxOffset = Math.max(
+    const lastRowOffset = Math.max(
       0,
-      Math.min(
-        rowCount * ((rowHeight: any): number) - height,
-        rowIndex * ((rowHeight: any): number)
-      )
+      rowCount * ((rowHeight: any): number) - height
+    );
+    const maxOffset = Math.min(
+      lastRowOffset,
+      rowIndex * ((rowHeight: any): number)
     );
     const minOffset = Math.max(
       0,
@@ -110,12 +127,27 @@ const FixedSizeGrid = createGridComponent({
       case 'end':
         return minOffset;
       case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+        // "Centered" offset is usually the average of the min and max.
+        // But near the edges of the list, this doesn't hold true.
+        const middleOffset = Math.round(
+          minOffset + (maxOffset - minOffset) / 2
+        );
+        if (middleOffset < Math.ceil(height / 2)) {
+          return 0; // near the beginning
+        } else if (middleOffset > lastRowOffset + Math.floor(height / 2)) {
+          return lastRowOffset; // near the end
+        } else {
+          return middleOffset;
+        }
       case 'auto':
       default:
         if (scrollTop >= minOffset && scrollTop <= maxOffset) {
           return scrollTop;
-        } else if (scrollTop - minOffset < maxOffset - scrollTop) {
+        } else if (minOffset > maxOffset) {
+          // Because we only take into account the scrollbar size when calculating minOffset
+          // this value can be larger than maxOffset when at the end of the list
+          return minOffset;
+        } else if (scrollTop < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -141,14 +173,14 @@ const FixedSizeGrid = createGridComponent({
     scrollLeft: number
   ): number => {
     const left = startIndex * ((columnWidth: any): number);
+    const numVisibleColumns = Math.ceil(
+      (width + scrollLeft - left) / ((columnWidth: any): number)
+    );
     return Math.max(
       0,
       Math.min(
         columnCount - 1,
-        startIndex +
-          Math.floor(
-            (width + (scrollLeft - left)) / ((columnWidth: any): number)
-          )
+        startIndex + numVisibleColumns - 1 // -1 is because stop index is inclusive
       )
     );
   },
@@ -167,13 +199,15 @@ const FixedSizeGrid = createGridComponent({
     startIndex: number,
     scrollTop: number
   ): number => {
-    const left = startIndex * ((rowHeight: any): number);
+    const top = startIndex * ((rowHeight: any): number);
+    const numVisibleRows = Math.ceil(
+      (height + scrollTop - top) / ((rowHeight: any): number)
+    );
     return Math.max(
       0,
       Math.min(
         rowCount - 1,
-        startIndex +
-          Math.floor((height + (scrollTop - left)) / ((rowHeight: any): number))
+        startIndex + numVisibleRows - 1 // -1 is because stop index is inclusive
       )
     );
   },
diff --git a/vendor/react-window/src/FixedSizeList.js b/vendor/react-window/src/FixedSizeList.js
index 991f9004305bc..0e0fc305bc301 100644
--- a/vendor/react-window/src/FixedSizeList.js
+++ b/vendor/react-window/src/FixedSizeList.js
@@ -5,10 +5,10 @@ import createListComponent from './createListComponent';
 import type { Props, ScrollToAlign } from './createListComponent';
 
 const FixedSizeList = createListComponent({
-  getItemOffset: ({ itemSize, size }: Props<any>, index: number): number =>
+  getItemOffset: ({ itemSize }: Props<any>, index: number): number =>
     index * ((itemSize: any): number),
 
-  getItemSize: ({ itemSize, size }: Props<any>, index: number): number =>
+  getItemSize: ({ itemSize }: Props<any>, index: number): number =>
     ((itemSize: any): number),
 
   getEstimatedTotalSize: ({ itemCount, itemSize }: Props<any>) =>
@@ -23,12 +23,13 @@ const FixedSizeList = createListComponent({
     // TODO Deprecate direction "horizontal"
     const isHorizontal = direction === 'horizontal' || layout === 'horizontal';
     const size = (((isHorizontal ? width : height): any): number);
-    const maxOffset = Math.max(
+    const lastItemOffset = Math.max(
       0,
-      Math.min(
-        itemCount * ((itemSize: any): number) - size,
-        index * ((itemSize: any): number)
-      )
+      itemCount * ((itemSize: any): number) - size
+    );
+    const maxOffset = Math.min(
+      lastItemOffset,
+      index * ((itemSize: any): number)
     );
     const minOffset = Math.max(
       0,
@@ -51,13 +52,25 @@ const FixedSizeList = createListComponent({
         return maxOffset;
       case 'end':
         return minOffset;
-      case 'center':
-        return Math.round(minOffset + (maxOffset - minOffset) / 2);
+      case 'center': {
+        // "Centered" offset is usually the average of the min and max.
+        // But near the edges of the list, this doesn't hold true.
+        const middleOffset = Math.round(
+          minOffset + (maxOffset - minOffset) / 2
+        );
+        if (middleOffset < Math.ceil(size / 2)) {
+          return 0; // near the beginning
+        } else if (middleOffset > lastItemOffset + Math.floor(size / 2)) {
+          return lastItemOffset; // near the end
+        } else {
+          return middleOffset;
+        }
+      }
       case 'auto':
       default:
         if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
           return scrollOffset;
-        } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+        } else if (scrollOffset < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
@@ -83,14 +96,14 @@ const FixedSizeList = createListComponent({
     const isHorizontal = direction === 'horizontal' || layout === 'horizontal';
     const offset = startIndex * ((itemSize: any): number);
     const size = (((isHorizontal ? width : height): any): number);
+    const numVisibleItems = Math.ceil(
+      (size + scrollOffset - offset) / ((itemSize: any): number)
+    );
     return Math.max(
       0,
       Math.min(
         itemCount - 1,
-        startIndex +
-          Math.floor(
-            (size + (scrollOffset - offset)) / ((itemSize: any): number)
-          )
+        startIndex + numVisibleItems - 1 // -1 is because stop index is inclusive
       )
     );
   },
diff --git a/vendor/react-window/src/VariableSizeGrid.js b/vendor/react-window/src/VariableSizeGrid.js
index a1273e198e0d4..46d59521f1978 100644
--- a/vendor/react-window/src/VariableSizeGrid.js
+++ b/vendor/react-window/src/VariableSizeGrid.js
@@ -274,7 +274,11 @@ const getOffsetForIndexAndAlignment = (
     default:
       if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
         return scrollOffset;
-      } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+      } else if (minOffset > maxOffset) {
+        // Because we only take into account the scrollbar size when calculating minOffset
+        // this value can be larger than maxOffset when at the end of the list
+        return minOffset;
+      } else if (scrollOffset < minOffset) {
         return minOffset;
       } else {
         return maxOffset;
diff --git a/vendor/react-window/src/VariableSizeList.js b/vendor/react-window/src/VariableSizeList.js
index cebadc663eb22..f4ad103231017 100644
--- a/vendor/react-window/src/VariableSizeList.js
+++ b/vendor/react-window/src/VariableSizeList.js
@@ -227,7 +227,7 @@ const VariableSizeList = createListComponent({
       default:
         if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {
           return scrollOffset;
-        } else if (scrollOffset - minOffset < maxOffset - scrollOffset) {
+        } else if (scrollOffset < minOffset) {
           return minOffset;
         } else {
           return maxOffset;
diff --git a/vendor/react-window/src/createGridComponent.js b/vendor/react-window/src/createGridComponent.js
index c72af855c7b22..f2895b60a4ea3 100644
--- a/vendor/react-window/src/createGridComponent.js
+++ b/vendor/react-window/src/createGridComponent.js
@@ -3,7 +3,7 @@
 import memoizeOne from 'memoize-one';
 import { createElement, PureComponent } from 'react';
 import { cancelTimeout, requestTimeout } from './timer';
-import { getScrollbarSize } from './domHelpers';
+import { getScrollbarSize, getRTLOffsetType } from './domHelpers';
 
 import type { TimeoutID } from './timer';
 
@@ -46,6 +46,22 @@ type OnScrollCallback = ({
 type ScrollEvent = SyntheticEvent<HTMLDivElement>;
 type ItemStyleCache = { [key: string]: Object };
 
+type OuterProps = {|
+  children: React$Node,
+  className: string | void,
+  onScroll: ScrollEvent => void,
+  style: {
+    [string]: mixed,
+  },
+|};
+
+type InnerProps = {|
+  children: React$Node,
+  style: {
+    [string]: mixed,
+  },
+|};
+
 export type Props<T> = {|
   children: RenderComponent<T>,
   className?: string,
@@ -56,7 +72,7 @@ export type Props<T> = {|
   initialScrollLeft?: number,
   initialScrollTop?: number,
   innerRef?: any,
-  innerElementType?: React$ElementType,
+  innerElementType?: string | React$AbstractComponent<InnerProps, any>,
   innerTagName?: string, // deprecated
   itemData: T,
   itemKey?: (params: {|
@@ -67,11 +83,13 @@ export type Props<T> = {|
   onItemsRendered?: OnItemsRenderedCallback,
   onScroll?: OnScrollCallback,
   outerRef?: any,
-  outerElementType?: React$ElementType,
+  outerElementType?: string | React$AbstractComponent<OuterProps, any>,
   outerTagName?: string, // deprecated
-  overscanColumnsCount?: number,
+  overscanColumnCount?: number,
+  overscanColumnsCount?: number, // deprecated
   overscanCount?: number, // deprecated
-  overscanRowsCount?: number,
+  overscanRowCount?: number,
+  overscanRowsCount?: number, // deprecated
   rowCount: number,
   rowHeight: itemSize,
   style?: Object,
@@ -130,10 +148,12 @@ const defaultItemKey = ({ columnIndex, data, rowIndex }) =>
 // In DEV mode, this Set helps us only log a warning once per component instance.
 // This avoids spamming the console every time a render happens.
 let devWarningsOverscanCount = null;
+let devWarningsOverscanRowsColumnsCount = null;
 let devWarningsTagName = null;
 if (process.env.NODE_ENV !== 'production') {
   if (typeof window !== 'undefined' && typeof window.WeakSet !== 'undefined') {
     devWarningsOverscanCount = new WeakSet();
+    devWarningsOverscanRowsColumnsCount = new WeakSet();
     devWarningsTagName = new WeakSet();
   }
 }
@@ -320,21 +340,47 @@ export default function createGridComponent({
 
     componentDidMount() {
       const { initialScrollLeft, initialScrollTop } = this.props;
-      if (typeof initialScrollLeft === 'number' && this._outerRef != null) {
-        ((this._outerRef: any): HTMLDivElement).scrollLeft = initialScrollLeft;
-      }
-      if (typeof initialScrollTop === 'number' && this._outerRef != null) {
-        ((this._outerRef: any): HTMLDivElement).scrollTop = initialScrollTop;
+
+      if (this._outerRef != null) {
+        const outerRef = ((this._outerRef: any): HTMLElement);
+        if (typeof initialScrollLeft === 'number') {
+          outerRef.scrollLeft = initialScrollLeft;
+        }
+        if (typeof initialScrollTop === 'number') {
+          outerRef.scrollTop = initialScrollTop;
+        }
       }
 
       this._callPropsCallbacks();
     }
 
     componentDidUpdate() {
+      const { direction } = this.props;
       const { scrollLeft, scrollTop, scrollUpdateWasRequested } = this.state;
-      if (scrollUpdateWasRequested && this._outerRef !== null) {
-        ((this._outerRef: any): HTMLDivElement).scrollLeft = scrollLeft;
-        ((this._outerRef: any): HTMLDivElement).scrollTop = scrollTop;
+
+      if (scrollUpdateWasRequested && this._outerRef != null) {
+        // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+        // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+        // So we need to determine which browser behavior we're dealing with, and mimic it.
+        const outerRef = ((this._outerRef: any): HTMLElement);
+        if (direction === 'rtl') {
+          switch (getRTLOffsetType()) {
+            case 'negative':
+              outerRef.scrollLeft = -scrollLeft;
+              break;
+            case 'positive-ascending':
+              outerRef.scrollLeft = scrollLeft;
+              break;
+            default:
+              const { clientWidth, scrollWidth } = outerRef;
+              outerRef.scrollLeft = scrollWidth - clientWidth - scrollLeft;
+              break;
+          }
+        } else {
+          outerRef.scrollLeft = Math.max(0, scrollLeft);
+        }
+
+        outerRef.scrollTop = Math.max(0, scrollTop);
       }
 
       this._callPropsCallbacks();
@@ -432,7 +478,7 @@ export default function createGridComponent({
           ref: innerRef,
           style: {
             height: estimatedTotalHeight,
-            pointerEvents: isScrolling ? 'none' : '',
+            pointerEvents: isScrolling ? 'none' : undefined,
             width: estimatedTotalWidth,
           },
         })
@@ -586,6 +632,7 @@ export default function createGridComponent({
     _getHorizontalRangeToRender(): [number, number, number, number] {
       const {
         columnCount,
+        overscanColumnCount,
         overscanColumnsCount,
         overscanCount,
         rowCount,
@@ -593,7 +640,7 @@ export default function createGridComponent({
       const { horizontalScrollDirection, isScrolling, scrollLeft } = this.state;
 
       const overscanCountResolved: number =
-        overscanColumnsCount || overscanCount || 1;
+        overscanColumnCount || overscanColumnsCount || overscanCount || 1;
 
       if (columnCount === 0 || rowCount === 0) {
         return [0, 0, 0, 0];
@@ -634,13 +681,14 @@ export default function createGridComponent({
       const {
         columnCount,
         overscanCount,
+        overscanRowCount,
         overscanRowsCount,
         rowCount,
       } = this.props;
       const { isScrolling, verticalScrollDirection, scrollTop } = this.state;
 
       const overscanCountResolved: number =
-        overscanRowsCount || overscanCount || 1;
+        overscanRowCount || overscanRowsCount || overscanCount || 1;
 
       if (columnCount === 0 || rowCount === 0) {
         return [0, 0, 0, 0];
@@ -679,9 +727,11 @@ export default function createGridComponent({
 
     _onScroll = (event: ScrollEvent): void => {
       const {
+        clientHeight,
         clientWidth,
         scrollLeft,
         scrollTop,
+        scrollHeight,
         scrollWidth,
       } = event.currentTarget;
       this.setState(prevState => {
@@ -697,24 +747,38 @@ export default function createGridComponent({
 
         const { direction } = this.props;
 
-        // HACK According to the spec, scrollLeft should be negative for RTL aligned elements.
-        // Chrome does not seem to adhere; its scrollLeft values are positive (measured relative to the left).
-        // See https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft
+        // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+        // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+        // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.
+        // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.
         let calculatedScrollLeft = scrollLeft;
         if (direction === 'rtl') {
-          if (scrollLeft <= 0) {
-            calculatedScrollLeft = -scrollLeft;
-          } else {
-            calculatedScrollLeft = scrollWidth - clientWidth - scrollLeft;
+          switch (getRTLOffsetType()) {
+            case 'negative':
+              calculatedScrollLeft = -scrollLeft;
+              break;
+            case 'positive-descending':
+              calculatedScrollLeft = scrollWidth - clientWidth - scrollLeft;
+              break;
           }
         }
 
+        // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
+        calculatedScrollLeft = Math.max(
+          0,
+          Math.min(calculatedScrollLeft, scrollWidth - clientWidth)
+        );
+        const calculatedScrollTop = Math.max(
+          0,
+          Math.min(scrollTop, scrollHeight - clientHeight)
+        );
+
         return {
           isScrolling: true,
           horizontalScrollDirection:
             prevState.scrollLeft < scrollLeft ? 'forward' : 'backward',
           scrollLeft: calculatedScrollLeft,
-          scrollTop,
+          scrollTop: calculatedScrollTop,
           verticalScrollDirection:
             prevState.scrollTop < scrollTop ? 'forward' : 'backward',
           scrollUpdateWasRequested: false,
@@ -768,7 +832,9 @@ const validateSharedProps = (
     height,
     innerTagName,
     outerTagName,
+    overscanColumnsCount,
     overscanCount,
+    overscanRowsCount,
     width,
   }: Props<any>,
   { instance }: State
@@ -779,7 +845,23 @@ const validateSharedProps = (
         devWarningsOverscanCount.add(instance);
         console.warn(
           'The overscanCount prop has been deprecated. ' +
-            'Please use the overscanColumnsCount and overscanRowsCount props instead.'
+            'Please use the overscanColumnCount and overscanRowCount props instead.'
+        );
+      }
+    }
+
+    if (
+      typeof overscanColumnsCount === 'number' ||
+      typeof overscanRowsCount === 'number'
+    ) {
+      if (
+        devWarningsOverscanRowsColumnsCount &&
+        !devWarningsOverscanRowsColumnsCount.has(instance)
+      ) {
+        devWarningsOverscanRowsColumnsCount.add(instance);
+        console.warn(
+          'The overscanColumnsCount and overscanRowsCount props have been deprecated. ' +
+            'Please use the overscanColumnCount and overscanRowCount props instead.'
         );
       }
     }
diff --git a/vendor/react-window/src/createListComponent.js b/vendor/react-window/src/createListComponent.js
index 86696a0b803e6..ae7851e9f402d 100644
--- a/vendor/react-window/src/createListComponent.js
+++ b/vendor/react-window/src/createListComponent.js
@@ -3,6 +3,7 @@
 import memoizeOne from 'memoize-one';
 import { createElement, PureComponent } from 'react';
 import { cancelTimeout, requestTimeout } from './timer';
+import { getRTLOffsetType } from './domHelpers';
 
 import type { TimeoutID } from './timer';
 
@@ -38,6 +39,22 @@ type onScrollCallback = ({
 type ScrollEvent = SyntheticEvent<HTMLDivElement>;
 type ItemStyleCache = { [index: number]: Object };
 
+type OuterProps = {|
+  children: React$Node,
+  className: string | void,
+  onScroll: ScrollEvent => void,
+  style: {
+    [string]: mixed,
+  },
+|};
+
+type InnerProps = {|
+  children: React$Node,
+  style: {
+    [string]: mixed,
+  },
+|};
+
 export type Props<T> = {|
   children: RenderComponent<T>,
   className?: string,
@@ -45,7 +62,7 @@ export type Props<T> = {|
   height: number | string,
   initialScrollOffset?: number,
   innerRef?: any,
-  innerElementType?: React$ElementType,
+  innerElementType?: string | React$AbstractComponent<InnerProps, any>,
   innerTagName?: string, // deprecated
   itemCount: number,
   itemData: T,
@@ -55,7 +72,7 @@ export type Props<T> = {|
   onItemsRendered?: onItemsRenderedCallback,
   onScroll?: onScrollCallback,
   outerRef?: any,
-  outerElementType?: React$ElementType,
+  outerElementType?: string | React$AbstractComponent<OuterProps, any>,
   outerTagName?: string, // deprecated
   overscanCount: number,
   style?: Object,
@@ -215,14 +232,13 @@ export default function createListComponent({
     componentDidMount() {
       const { direction, initialScrollOffset, layout } = this.props;
 
-      if (typeof initialScrollOffset === 'number' && this._outerRef !== null) {
+      if (typeof initialScrollOffset === 'number' && this._outerRef != null) {
+        const outerRef = ((this._outerRef: any): HTMLElement);
         // TODO Deprecate direction "horizontal"
         if (direction === 'horizontal' || layout === 'horizontal') {
-          ((this
-            ._outerRef: any): HTMLDivElement).scrollLeft = initialScrollOffset;
+          outerRef.scrollLeft = initialScrollOffset;
         } else {
-          ((this
-            ._outerRef: any): HTMLDivElement).scrollTop = initialScrollOffset;
+          outerRef.scrollTop = initialScrollOffset;
         }
       }
 
@@ -233,12 +249,32 @@ export default function createListComponent({
       const { direction, layout } = this.props;
       const { scrollOffset, scrollUpdateWasRequested } = this.state;
 
-      if (scrollUpdateWasRequested && this._outerRef !== null) {
+      if (scrollUpdateWasRequested && this._outerRef != null) {
+        const outerRef = ((this._outerRef: any): HTMLElement);
+
         // TODO Deprecate direction "horizontal"
         if (direction === 'horizontal' || layout === 'horizontal') {
-          ((this._outerRef: any): HTMLDivElement).scrollLeft = scrollOffset;
+          if (direction === 'rtl') {
+            // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+            // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+            // So we need to determine which browser behavior we're dealing with, and mimic it.
+            switch (getRTLOffsetType()) {
+              case 'negative':
+                outerRef.scrollLeft = -scrollOffset;
+                break;
+              case 'positive-ascending':
+                outerRef.scrollLeft = scrollOffset;
+                break;
+              default:
+                const { clientWidth, scrollWidth } = outerRef;
+                outerRef.scrollLeft = scrollWidth - clientWidth - scrollOffset;
+                break;
+            }
+          } else {
+            outerRef.scrollLeft = scrollOffset;
+          }
         } else {
-          ((this._outerRef: any): HTMLDivElement).scrollTop = scrollOffset;
+          outerRef.scrollTop = scrollOffset;
         }
       }
 
@@ -326,7 +362,7 @@ export default function createListComponent({
           ref: innerRef,
           style: {
             height: isHorizontal ? '100%' : estimatedTotalSize,
-            pointerEvents: isScrolling ? 'none' : '',
+            pointerEvents: isScrolling ? 'none' : undefined,
             width: isHorizontal ? estimatedTotalSize : '100%',
           },
         })
@@ -496,18 +532,28 @@ export default function createListComponent({
 
         const { direction } = this.props;
 
-        // HACK According to the spec, scrollLeft should be negative for RTL aligned elements.
-        // Chrome does not seem to adhere; its scrolLeft values are positive (measured relative to the left).
-        // See https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft
         let scrollOffset = scrollLeft;
         if (direction === 'rtl') {
-          if (scrollLeft <= 0) {
-            scrollOffset = -scrollOffset;
-          } else {
-            scrollOffset = scrollWidth - clientWidth - scrollLeft;
+          // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+          // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).
+          // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.
+          // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.
+          switch (getRTLOffsetType()) {
+            case 'negative':
+              scrollOffset = -scrollLeft;
+              break;
+            case 'positive-descending':
+              scrollOffset = scrollWidth - clientWidth - scrollLeft;
+              break;
           }
         }
 
+        // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
+        scrollOffset = Math.max(
+          0,
+          Math.min(scrollOffset, scrollWidth - clientWidth)
+        );
+
         return {
           isScrolling: true,
           scrollDirection:
@@ -519,7 +565,7 @@ export default function createListComponent({
     };
 
     _onScrollVertical = (event: ScrollEvent): void => {
-      const { scrollTop } = event.currentTarget;
+      const { clientHeight, scrollHeight, scrollTop } = event.currentTarget;
       this.setState(prevState => {
         if (prevState.scrollOffset === scrollTop) {
           // Scroll position may have been updated by cDM/cDU,
@@ -528,11 +574,17 @@ export default function createListComponent({
           return null;
         }
 
+        // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.
+        const scrollOffset = Math.max(
+          0,
+          Math.min(scrollTop, scrollHeight - clientHeight)
+        );
+
         return {
           isScrolling: true,
           scrollDirection:
-            prevState.scrollOffset < scrollTop ? 'forward' : 'backward',
-          scrollOffset: scrollTop,
+            prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',
+          scrollOffset,
           scrollUpdateWasRequested: false,
         };
       }, this._resetIsScrollingDebounced);
diff --git a/vendor/react-window/src/domHelpers.js b/vendor/react-window/src/domHelpers.js
index 830aba68d79aa..1bdc9dddc10aa 100644
--- a/vendor/react-window/src/domHelpers.js
+++ b/vendor/react-window/src/domHelpers.js
@@ -20,3 +20,53 @@ export function getScrollbarSize(recalculate?: boolean = false): number {
 
   return size;
 }
+
+export type RTLOffsetType =
+  | 'negative'
+  | 'positive-descending'
+  | 'positive-ascending';
+
+let cachedRTLResult: RTLOffsetType | null = null;
+
+// TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.
+// Chrome does not seem to adhere; its scrollLeft values are positive (measured relative to the left).
+// Safari's elastic bounce makes detecting this even more complicated wrt potential false positives.
+// The safest way to check this is to intentionally set a negative offset,
+// and then verify that the subsequent "scroll" event matches the negative offset.
+// If it does not match, then we can assume a non-standard RTL scroll implementation.
+export function getRTLOffsetType(recalculate?: boolean = false): RTLOffsetType {
+  if (cachedRTLResult === null || recalculate) {
+    const outerDiv = document.createElement('div');
+    const outerStyle = outerDiv.style;
+    outerStyle.width = '50px';
+    outerStyle.height = '50px';
+    outerStyle.overflow = 'scroll';
+    outerStyle.direction = 'rtl';
+
+    const innerDiv = document.createElement('div');
+    const innerStyle = innerDiv.style;
+    innerStyle.width = '100px';
+    innerStyle.height = '100px';
+
+    outerDiv.appendChild(innerDiv);
+
+    ((document.body: any): HTMLBodyElement).appendChild(outerDiv);
+
+    if (outerDiv.scrollLeft > 0) {
+      cachedRTLResult = 'positive-descending';
+    } else {
+      outerDiv.scrollLeft = 1;
+      if (outerDiv.scrollLeft === 0) {
+        cachedRTLResult = 'negative';
+      } else {
+        cachedRTLResult = 'positive-ascending';
+      }
+    }
+
+    ((document.body: any): HTMLBodyElement).removeChild(outerDiv);
+
+    return cachedRTLResult;
+  }
+
+  return cachedRTLResult;
+}
diff --git a/yarn.lock b/yarn.lock
index 616e6e2645205..76c0f0e882c1c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -766,9 +766,9 @@
     regenerator-runtime "^0.12.0"
 
 "@babel/runtime@^7.0.0":
-  version "7.4.5"
-  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.4.5.tgz#582bb531f5f9dc67d2fcb682979894f75e253f12"
-  integrity sha512-TuI4qpWZP6lGOGIuGWtp9sPluqYICmbk8T/1vpSysqJxRPkudh/ofFWyqdcMsDf2s7KvDL4/YHgKyvcS3g9CJQ==
+  version "7.5.5"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.5.5.tgz#74fba56d35efbeca444091c7850ccd494fd2f132"
+  integrity sha512-28QvEGyQyNkB0/m2B4FU7IEZGK2NUrcMtT6BZEFALTguLk+AUT6ofsHtPk5QyjAdUkpMJ+/Em+quwz4HOt30AQ==
   dependencies:
     regenerator-runtime "^0.13.2"
 
@@ -5522,10 +5522,10 @@ flatstr@^1.0.9:
   resolved "https://registry.yarnpkg.com/flatstr/-/flatstr-1.0.9.tgz#0950d56fec02de1030c1311847ecd58c25690eb9"
   integrity sha512-qFlJnOBWDfIaunF54/lBqNKmXOI0HqNhu+mHkLmbaBXlS71PUd9OjFOdyevHt/aHoHB1+eW7eKHgRKOG5aHSpw==
 
-flow-bin@^0.97.0:
-  version "0.97.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.97.0.tgz#036ffcfc27503367a9d906ec9d843a0aa6f6bb83"
-  integrity sha512-jXjD05gkatLuC4+e28frH1hZoRwr1iASP6oJr61Q64+kR4kmzaS+AdFBhYgoYS5kpoe4UzwDebWK8ETQFNh00w==
+flow-bin@^0.103.0:
+  version "0.103.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.103.0.tgz#7aec510d85e1c1b0f2b912bb988337d70035cb0f"
+  integrity sha512-Y3yrnE5ICN1Kl/y10BwjA3JSuS+gt4jVPNyUNCZb0RqmkdssMrW8QNNysJYvhgAY/JBJH8Qv7NVUf11MiwfSlA==
 
 fluent-syntax@0.10.0:
   version "0.10.0"
@@ -8250,9 +8250,9 @@ mem@^4.0.0:
     p-is-promise "^2.0.0"
 
 "memoize-one@>=3.1.1 <6":
-  version "5.0.4"
-  resolved "https://registry.yarnpkg.com/memoize-one/-/memoize-one-5.0.4.tgz#005928aced5c43d890a4dfab18ca908b0ec92cbc"
-  integrity sha512-P0z5IeAH6qHHGkJIXWw0xC2HNEgkx/9uWWBQw64FJj3/ol14VYdfVGWWr0fXfjhhv3TKVIqUq65os6O4GUNksA==
+  version "5.0.5"
+  resolved "https://registry.yarnpkg.com/memoize-one/-/memoize-one-5.0.5.tgz#8cd3809555723a07684afafcd6f756072ac75d7e"
+  integrity sha512-ey6EpYv0tEaIbM/nTDOpHciXUvd+ackQrJgEzBwemhZZIWZjcyodqEcrmqDy2BKRTM3a65kKBV4WtLXJDt26SQ==
 
 memoize-one@^3.1.1:
   version "3.1.1"
@@ -10183,9 +10183,9 @@ regenerator-runtime@^0.12.0:
   integrity sha512-odxIc1/vDlo4iZcfXqRYFj0vpXFNoGdKMAUieAlFYO6m/nl5e9KR/beGf41z4a1FI+aQgtjhuaSlDxQ0hmkrHg==
 
 regenerator-runtime@^0.13.2:
-  version "0.13.2"
-  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.2.tgz#32e59c9a6fb9b1a4aff09b4930ca2d4477343447"
-  integrity sha512-S/TQAZJO+D3m9xeN1WTI8dLKBBiRgXBlTJvbWjCThHWZj9EvHK70Ff50/tYj2J/fvBY6JtFVwRuazHN2E7M9BA==
+  version "0.13.3"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.3.tgz#7cf6a77d8f5c6f60eb73c5fc1955b2ceb01e6bf5"
+  integrity sha512-naKIZz2GQ8JWh///G7L3X6LaQUAMp2lvb1rvwwsURe/VXwD6VMfr+/1NuNw3ag8v2kY1aQ/go5SNn79O9JU7yw==
 
 regenerator-runtime@^0.9.5:
   version "0.9.6"