Update Launcher UI when model changes are made outside of Launcher UI

Bug: 305877212
Flag: EXEMPT bugfix
Test: Verified manually by modifing folder in taskbar
Change-Id: I513dcfbc9e4ffcd970766ce8352815571e576461

quickstep/src/com/android/launcher3/taskbar/TaskbarViewController.java

@@ -81,6 +81,7 @@ import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.anim.RevealOutlineAnimation;
 import com.android.launcher3.anim.RoundedRectRevealOutlineProvider;
 import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.model.ModelWriter;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.model.data.TaskItemInfo;
 import com.android.launcher3.taskbar.bubbles.BubbleBarController;
@@ -412,6 +413,12 @@ public class TaskbarViewController implements TaskbarControllers.LoggableTaskbar
         return mTaskbarIconAlpha;
     }
 
+    /** Creates a ModelWriter for updating model properties */
+    public ModelWriter getModelWriter() {
+        return LauncherAppState.getInstance(mActivity).getModel()
+                .getWriter(false, mActivity.getCellPosMapper(), mModelCallbacks);
+    }
+
     /**
      * Should be called when the recents button is disabled, so we can hide Taskbar icons as well.
      */