Merge "Fix preview for 2 pane small width (2/n)" into udc-dev am: 1d9388ad

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/23221197



Change-Id: I0c762312cde1fb3400e6afd84ec5a5ca73d40e83
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>