Unstash taskbar due to IME immediately when system gesture starts am: fa696568e5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/26852022

Change-Id: I09b82105630add2755057d665619e32d6e3a8154
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>