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Fix windowless splash won't removed while hovering back gesture.
The windowless surface can be add after transition ready in core, so there can defer the check until transaction applied. Flag: EXEMPT bugfix Bug: 372230928 Test: create windowless splash instead of snapshot, verify windowless splash get removed as soon as prepare back transition ready. Change-Id: I306b1d936504c48bd83d2185a54ecbddd0720d3e