fix: use Map for decorationMarkerDestroyedSubscriptions

Author: aminya

lib/mixins/decoration-management.js

@@ -51,7 +51,7 @@ export default class DecorationManagement {
      * @type {Object}
      * @access private
      */
-    this.decorationMarkerDestroyedSubscriptions = {}
+    this.decorationMarkerDestroyedSubscriptions = new Map()
     /**
      * The subscriptions to the decorations `did-change-properties` event
      * indexed using the decoration id.
@@ -338,11 +338,11 @@ export default class DecorationManagement {
       decorationParams.scope = `.minimap .${cls}`
     }
 
-    if (this.decorationMarkerDestroyedSubscriptions[id] == null) {
-      this.decorationMarkerDestroyedSubscriptions[id] =
+    if (!this.decorationMarkerDestroyedSubscriptions.has(id)) {
+      this.decorationMarkerDestroyedSubscriptions.set(id,
       marker.onDidDestroy(() => {
         this.removeAllDecorationsForMarker(marker)
-      })
+      }))
     }
 
     if (!this.decorationMarkerChangedSubscriptions.has(id)) {
@@ -593,11 +593,11 @@ export default class DecorationManagement {
     if (marker == null) { return }
 
     this.decorationMarkerChangedSubscriptions.get(marker.id).dispose()
-    this.decorationMarkerDestroyedSubscriptions[marker.id].dispose()
+    this.decorationMarkerDestroyedSubscriptions.get(marker.id).dispose()
 
     this.decorationsByMarkerId.delete(marker.id)
     this.decorationMarkerChangedSubscriptions.delete(marker.id)
-    delete this.decorationMarkerDestroyedSubscriptions[marker.id]
+    this.decorationMarkerDestroyedSubscriptions.delete(marker.id)
   }
 
   /**
@@ -609,8 +609,9 @@ export default class DecorationManagement {
       decoration.dispose()
     }
 
-    for (const id in this.decorationMarkerDestroyedSubscriptions) {
-      this.decorationMarkerDestroyedSubscriptions[id].dispose()
+    const decorationMarkerDestroyedSubscriptionsValues = this.decorationMarkerDestroyedSubscriptions.values()
+    for (const decoration of decorationMarkerDestroyedSubscriptionsValues) {
+      decoration.dispose()
     }
 
     for (const id in this.decorationUpdatedSubscriptions) {
@@ -629,7 +630,7 @@ export default class DecorationManagement {
     this.decorationsById.clear()
     this.decorationsByMarkerId.clear()
     this.decorationMarkerChangedSubscriptions.clear()
-    this.decorationMarkerDestroyedSubscriptions = {}
+    this.decorationMarkerDestroyedSubscriptions.clear()
     this.decorationUpdatedSubscriptions = {}
     this.decorationDestroyedSubscriptions = {}
   }