Log stackstrace if updateIconAlphaForHome is called after Taskbar is destroyed

Bug: 269409332
Test: manual
Change-Id: I0ff4be33b1e621b0e1a837f8211eb70c27368be1
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarLauncherStateController.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarLauncherStateController.java
index 80cdbe9..6432119 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarLauncherStateController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarLauncherStateController.java
@@ -454,6 +454,10 @@
     }
 
     private void updateIconAlphaForHome(float alpha) {
+        if (mControllers.taskbarActivityContext.isDestroyed()) {
+            Log.e("b/260135164", "updateIconAlphaForHome is called after Taskbar is destroyed",
+                    new Exception());
+        }
         mIconAlphaForHome.setValue(alpha);
         boolean hotseatVisible = alpha == 0
                 || (!mControllers.uiController.isHotseatIconOnTopWhenAligned()