feat: reuse domStylesReader between editors

lib/main.js

@@ -6,6 +6,7 @@ import Minimap from './minimap'
 import config from './config.json'
 import * as PluginManagement from './plugin-management'
 import { treeSitterWarning } from './performance-monitor'
+import DOMStylesReader from './dom-styles-reader'
 
 export { default as config } from './config.json'
 export * from './plugin-management'
@@ -63,6 +64,12 @@ let subscriptionsOfCommands = null
      */
 export const emitter = new Emitter()
 
+
+/**
+  DOMStylesReader cache used for storing token colors
+*/
+let DOMStylesReaderInstance = null
+
 /**
    * Activates the minimap package.
    */
@@ -85,6 +92,8 @@ export function activate () {
   })
 
   editorsMinimaps = new Map()
+  DOMStylesReaderInstance = new DOMStylesReader()
+
   subscriptions = new CompositeDisposable()
   active = true
 
@@ -100,6 +109,8 @@ export function activate () {
 export function minimapViewProvider (model) {
   if (model instanceof Minimap) {
     const element = new MinimapElement()
+    // add DOMStylesReaderInstance
+    element.DOMStylesReader = DOMStylesReaderInstance;
     element.setModel(model)
     return element
   }
@@ -125,6 +136,7 @@ export function deactivate () {
   subscriptionsOfCommands.dispose()
   subscriptionsOfCommands = null
   editorsMinimaps = undefined
+  DOMStylesReaderInstance.invalidateDOMStylesCache()
   toggled = false
   active = false
 }
@@ -153,6 +165,7 @@ export function toggle () {
     toggled = true
     initSubscriptions()
   }
+  DOMStylesReaderInstance.invalidateDOMStylesCache()
 }
 
 /**

lib/mixins/canvas-drawer.js

@@ -5,7 +5,6 @@ import Mixin from 'mixto'
 
 import * as Main from '../main'
 import CanvasLayer from '../canvas-layer'
-import DOMStylesReader from '../dom-styles-reader'
 
 const SPEC_MODE = atom.inSpecMode()
 
@@ -76,11 +75,6 @@ export default class CanvasDrawer extends Mixin {
 
     // the maximum number of tokens to render in one line
     this.maxTokensInOneLine = atom.config.get('minimap.maxTokensInOneLine')
-
-    /**
-     * This MinimapElement's DOMStylesReader
-     */
-    this.DOMStylesReader = new DOMStylesReader()
   }
 
   /**