fix: return destoryed decoration and disposable on fallback

lib/minimap.js

@@ -6,6 +6,11 @@ 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()
+
 /**
  * The Minimap class is the underlying model of a <MinimapElement>.
  * Most manipulations of the minimap is done through the model.
@@ -1125,25 +1130,25 @@ export default class Minimap {
     return this.getDecorationManagement()?.getDecorations() ?? []
   }
   onDidAddDecoration(...args) {
-    return this.getDecorationManagement()?.onDidAddDecoration(...args) ?? new Disposable()
+    return this.getDecorationManagement()?.onDidAddDecoration(...args) ?? disposedDisposable
   }
   onDidRemoveDecoration(...args) {
-    return this.getDecorationManagement()?.onDidRemoveDecoration(...args) ?? new Disposable()
+    return this.getDecorationManagement()?.onDidRemoveDecoration(...args) ?? disposedDisposable
   }
   onDidChangeDecorationRange(...args) {
-    return this.getDecorationManagement()?.onDidChangeDecorationRange(...args) ?? new Disposable()
+    return this.getDecorationManagement()?.onDidChangeDecorationRange(...args) ?? disposedDisposable
   }
   onDidUpdateDecoration(...args) {
-    return this.getDecorationManagement()?.onDidUpdateDecoration(...args) ?? new Disposable()
+    return this.getDecorationManagement()?.onDidUpdateDecoration(...args) ?? disposedDisposable
   }
   decorationForId(...args) {
-    return this.getDecorationManagement()?.decorationForId(...args) ?? {}
+    return this.getDecorationManagement()?.decorationForId(...args) ?? destoryedDecorationMock
   }
   decorationsForScreenRowRange(...args) {
-    return this.getDecorationManagement()?.decorationsForScreenRowRange(...args) ?? {}
+    return this.getDecorationManagement()?.decorationsForScreenRowRange(...args) ?? destoryedDecorationMock
   }
   decorationsByTypeThenRows() {
-    return this.getDecorationManagement()?.decorationsByTypeThenRows() ?? {}
+    return this.getDecorationManagement()?.decorationsByTypeThenRows() ?? destoryedDecorationMock
   }
   decorateMarker(...args) {
     return this.getDecorationManagement()?.decorateMarker(...args)