Fix small bug with DWB banners not animating out promptly

This CL fixes an issue where initiating split select on a task with a DWB banner would result in the DWB banner sticking around long after the thumbnail itself fades, interfering visually with the rest of the animation.

Fixed by hiding all child views of the taskview when splitting, instead of just the thumbnail.

Fixes: 247257724
Test: Manual
Change-Id: I4dbeccf8dd28431749df5e78482e80aacf5df55a

quickstep/src/com/android/quickstep/views/TaskView.java

@@ -387,7 +387,7 @@ public class TaskView extends FrameLayout implements Reusable {
 
     private final float[] mIconCenterCoords = new float[2];
 
-    private final PointF mLastTouchDownPosition = new PointF();
+    protected final PointF mLastTouchDownPosition = new PointF();
 
     private boolean mIsClickableAsLiveTile = true;
 
@@ -584,16 +584,16 @@ public class TaskView extends FrameLayout implements Reusable {
      *         second app. {@code false} otherwise
      */
     private boolean confirmSecondSplitSelectApp() {
-        int index = getChildTaskIndexAtPosition(mLastTouchDownPosition);
+        int index = getLastSelectedChildTaskIndex();
         TaskIdAttributeContainer container = mTaskIdAttributeContainer[index];
         return getRecentsView().confirmSplitSelect(this, container.getTask(),
                 container.getIconView(), container.getThumbnailView());
     }
 
     /**
-     * Returns the task under the given position in the local coordinates of this task view.
+     * Returns the task index of the last selected child task (0 or 1).
      */
-    protected int getChildTaskIndexAtPosition(PointF position) {
+    protected int getLastSelectedChildTaskIndex() {
         return 0;
     }
 
@@ -1516,8 +1516,17 @@ public class TaskView extends FrameLayout implements Reusable {
         return display != null ? display.getDisplayId() : DEFAULT_DISPLAY;
     }
 
+    /**
+     *     Sets visibility for the thumbnail and associated elements (DWB banners and action chips).
+     *     IconView is unaffected.
+     */
     void setThumbnailVisibility(int visibility) {
-        mSnapshotView.setVisibility(visibility);
+        for (int i = 0; i < getChildCount(); i++) {
+            View child = getChildAt(i);
+            if (child != mIconView) {
+                child.setVisibility(visibility);
+            }
+        }
     }
 
     /**