Merge "Fix accident evict if drag same app to same position." into udc-dev am: cf02b08d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22954939



Change-Id: I01b635d907a6e45d5efd4582d468488ea5e95a56
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>