Merge "Ignore non-pointer events in LetterboxScrollProcessor" into main

    @Nullable

    @VisibleForTesting(visibility = PACKAGE)

    public List<MotionEvent> processMotionEvent(@NonNull MotionEvent motionEvent) {

        if (!motionEvent.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) {

            // This is a non-pointer event that doesn't correspond to any location on the screen.

            // Ignore it.

            return null;

        }

        mProcessedEvents.clear();

        final Rect appBounds = getAppBounds();