Fix null surface crash when switch split

This crash is caused by doble tap sometimes trigger onResizing at
same time. This might be gesture limitation. We should avoid doing
screenshot fade-out animation at such situation because its bounds
didn't change.

Fix: 261809537
Test: manual
Test: pass existing tests
Change-Id: Ida6b6e5f9a19cc2a403bb97d8bc1744c24ad90f7