This means that when TaskOverlayViewModel.overlayState is combining flows it does it on background. If this combination results in an emission then there is still a message to main but if it does not emit (e.g. no change filtered by distinctUntilChanged()) then it will not result in a continuation on main.
Bug: 387511656
Flag: com.android.launcher3.enable_refactor_task_thumbnail
Test: Checking perfetto traces shows that this reduces the number of continuations on main significantly
Test: Manual - overlay presence + select functionality
Test: Presubmit (TAPL/image tests etc)
Change-Id: I840cb86e91db5a0626191b5eab145978ef4192e9
Uwais Ashraf
201ae49e99