Layout:Panel With Transition

Build 2618 on feat-button-rework
Reviewing disabled
Baseline History
Build 26186e0635a
Current build. There are unaccepted changes, so build 2614 is still the baseline.
Build 2614733cf85 current baseline
Accepted by Andrey Yamanov.
Build 26065e26c44
Accepted by Andrey Yamanov.
Build 25719ff752e
Accepted by Andrey Yamanov.
Build 256955bebe4
Auto-accepted
Commenting is disabled because there's a newer build on this branch