Don't snap to focused task in split select

- In split select there is no overview actions, and focused task's snappign position is not centered, it's weird to snap so avoid it
- Follow-up of ag/16378986

Bug: 208644826
Test: manual
Change-Id: I260b5c6164db562717346396b1830af02d408944

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

@@ -1279,6 +1279,9 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
                             : getScrollForPage(mNextPage);
 
             if (showAsGrid()) {
+                if (isSplitSelectionActive()) {
+                    return;
+                }
                 TaskView taskView = getTaskViewAt(mNextPage);
                 // Only snap to fully visible focused task.
                 if (taskView == null