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

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



Change-Id: If276ebadb2562b534c477d4f12268bfb0b6fb2aa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>