Fix janky Alt+Tab through overview animation

Flag: not needed
Fixes: 282172884
Test: used alt+tab in overview; also launched overview through keyboard quick switch view
Change-Id: I3d1e54cda317ee8f8d2b2d698480cd3ca01dfc85

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

@@ -5975,6 +5975,13 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
         dispatchScrollChanged();
     }
 
+    @Override
+    protected boolean shouldHandleRequestChildFocus() {
+        // If we are already scrolling to a task view, then the focus request has already been
+        // handled
+        return mScroller.isFinished();
+    }
+
     private void dispatchScrollChanged() {
         runActionOnRemoteHandles(remoteTargetHandle ->
                 remoteTargetHandle.getTaskViewSimulator().setScroll(getScrollOffset()));