Layout:Panel With Transition

Build 2639 on fix-layout-issues
Reviewing disabled
Baseline History
Build 26393bb78d2
Current build. There are unaccepted changes, so build 2621 is still the baseline.
Build 2621a5789a0 current baseline
Accepted by Andrey Yamanov.
Build 2614733cf85
Accepted by Andrey Yamanov.
Build 26065e26c44
Accepted by Andrey Yamanov.
Build 25719ff752e
Accepted by Andrey Yamanov.
Commenting is disabled because there's a newer build on this branch