fix: return a real destroyed decoration

lib/minimap.js

@@ -1,15 +1,21 @@
 "use strict"
 
 import { Emitter, CompositeDisposable, Disposable } from "atom"
+import Decoration from "./decoration"
 import StableAdapter from "./adapters/stable-adapter"
 import { editorsMinimaps } from "./main"
 
 let nextModelId = 1
 
 // returned in the decorations API when minimap is destoryed
-const destoryedDecorationMock = { destroyed: true }
 const disposedDisposable = new Disposable()
 disposedDisposable.dispose()
+const markerMock = {
+  onDidDestroy: () => disposedDisposable,
+  getScreenRange: () => ({}),
+}
+const destoryedDecoration = new Decoration(markerMock, null, {})
+destoryedDecoration.destroy()
 
 /**
  * The Minimap class is the underlying model of a <MinimapElement>.
@@ -1142,16 +1148,16 @@ export default class Minimap {
     return this.getDecorationManagement()?.onDidUpdateDecoration(...args) ?? disposedDisposable
   }
   decorationForId(...args) {
-    return this.getDecorationManagement()?.decorationForId(...args) ?? destoryedDecorationMock
+    return this.getDecorationManagement()?.decorationForId(...args) ?? destoryedDecoration
   }
   decorationsForScreenRowRange(...args) {
-    return this.getDecorationManagement()?.decorationsForScreenRowRange(...args) ?? destoryedDecorationMock
+    return this.getDecorationManagement()?.decorationsForScreenRowRange(...args) ?? destoryedDecoration
   }
   decorationsByTypeThenRows() {
-    return this.getDecorationManagement()?.decorationsByTypeThenRows() ?? destoryedDecorationMock
+    return this.getDecorationManagement()?.decorationsByTypeThenRows() ?? destoryedDecoration
   }
   decorateMarker(...args) {
-    return this.getDecorationManagement()?.decorateMarker(...args)
+    return this.getDecorationManagement()?.decorateMarker(...args) ?? destoryedDecoration
   }
   removeDecoration(...args) {
     return this.getDecorationManagement()?.removeDecoration(...args)