Merge "Fix unexpectedly dismiss split by dragging the same app to the same...

Merge "Fix unexpectedly dismiss split by dragging the same app to the same side" into tm-qpr-dev am: 187565c2 am: fd2b0fad

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20648327



Change-Id: I5525c2eb8f376b8da9b9c9b925004c54c447da61
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>