Layout:Resizable Panes

Build 3095 on feat-remove-reset-style
Reviewing disabled
Baseline History
Build 30957706093
Current build. There are unaccepted changes, so build 2752 is still the baseline.
Build 275208ed3c8 current baseline
Accepted by Andrey Yamanov.
Build 258343caac6
Auto-accepted
Commenting is disabled because there's a newer build on this branch