Merge "Proper fix for gesture nav flicker using runOnPageScrollsInitialized()" into tm-qpr-dev am: 4b2bf90f2c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/18902861

Change-Id: Iddd40148542e59405c836044592f62ae8fbfcd46
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java

@@ -444,7 +444,7 @@ public abstract class AbsSwipeUpHandler<T extends StatefulActivity<S>,
             });
 
         setupRecentsViewUi();
-        linkRecentsViewScroll();
+        mRecentsView.runOnPageScrollsInitialized(this::linkRecentsViewScroll);
         activity.runOnBindToTouchInteractionService(this::onLauncherBindToService);
 
         mActivity.registerActivityLifecycleCallbacks(mLifecycleCallbacks);

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

@@ -2303,7 +2303,7 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
         boolean runningTaskTileHidden = mRunningTaskTileHidden;
         setCurrentTask(runningTaskViewId);
         mFocusedTaskViewId = runningTaskViewId;
-        setCurrentPage(getRunningTaskIndex());
+        runOnPageScrollsInitialized(() -> setCurrentPage(getRunningTaskIndex()));
         setRunningTaskViewShowScreenshot(false);
         setRunningTaskHidden(runningTaskTileHidden);
         // Update task size after setting current task.

src/com/android/launcher3/PagedView.java

@@ -1187,9 +1187,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
     }
 
     public int getScrollForPage(int index) {
-        // TODO(b/233112195): Use !pageScrollsInitialized() instead of mPageScrolls == null, once we
-        // root cause where we should be using runOnPageScrollsInitialized().
-        if (mPageScrolls == null || index >= mPageScrolls.length || index < 0) {
+        if (!pageScrollsInitialized() || index >= mPageScrolls.length || index < 0) {
             return 0;
         } else {
             return mPageScrolls[index];