Layout:Multiple Panels

Build 2613 on feat-layout-auto-border
Reviewing disabled
Baseline History
Build 2613279adef
Current build. There are unaccepted changes, so build 2606 is still the baseline.
Build 26065e26c44 current baseline
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