bug: setup onDidAcitvePanelChange subscription quicker

Author: mathuo

packages/dockview-core/src/api/dockviewGroupPanelApi.ts

@@ -50,8 +50,7 @@ export class DockviewGroupPanelApiImpl extends GridviewPanelApiImpl {
     readonly onDidLocationChange: Event<DockviewGroupPanelFloatingChangeEvent> =
         this._onDidLocationChange.event;
 
-    private readonly _onDidActivePanelChange =
-        new Emitter<DockviewGroupChangeEvent>();
+    readonly _onDidActivePanelChange = new Emitter<DockviewGroupChangeEvent>();
     readonly onDidActivePanelChange = this._onDidActivePanelChange.event;
 
     get location(): DockviewGroupLocation {
@@ -140,21 +139,6 @@ export class DockviewGroupPanelApiImpl extends GridviewPanelApiImpl {
     }
 
     initialize(group: DockviewGroupPanel): void {
-        /**
-         * TODO: Annoying initialization order caveat, find a better way to initialize and avoid needing null checks
-         *
-         * Due to the order on initialization we know that the model isn't defined until later in the same stack-frame of setup.
-         * By queuing a microtask we can ensure the setup is completed within the same stack-frame, but after everything else has
-         * finished ensuring the `model` is defined.
-         */
-
         this._group = group;
-
-        queueMicrotask(() => {
-            this._mutableDisposable.value =
-                this._group!.model.onDidActivePanelChange((event) => {
-                    this._onDidActivePanelChange.fire(event);
-                });
-        });
     }
 }

packages/dockview-core/src/dockview/dockviewGroupPanel.ts

@@ -124,6 +124,12 @@ export class DockviewGroupPanel
             options,
             this
         );
+
+        this.addDisposables(
+            this.model.onDidActivePanelChange((event) => {
+                this.api._onDidActivePanelChange.fire(event);
+            })
+        );
     }
 
     override focus(): void {