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b78f7de733
Attaching: The surface control from Launcher's ViewRootImpl is occiasionally invalid when back gesture starts, and parenting scrim to it would fail. We work around this by retrying later on back progressed. Dettaching: The scrim is not detached in all code paths. We now always check and detach in finishAnimation() if needed. This also fixes a possible flicker at the beginning of the transition. We wait until Launcher is started (and draws at least one frame) to animate the top window. Test: m -j Test: Repeatedly trigger back to home animation. Make sure the scrim attaches and detaches always. Bug:271606843 Bug:297808832 Bug:217988970 Fixes:271606843 Fixes:297808832 Fixes:217988970 Change-Id: I8b9b023f1fd54bcedd0be15196165e19e8400af7