Complex Layout:Container Layout

Build 4539 on claude/focused-brahmagupta-9pqdlm
Reviewing disabled
Baseline History
Build 45394e345ea
Current build. There are unaccepted changes, so build 4086 is still the baseline.
Build 37797b42bd6
Accepted by Andrey Yamanov.
Build 35056abd6e1
Accepted by Andrey Yamanov.
Build 348804d941a
Accepted by Andrey Yamanov.
Commenting is disabled because there's a newer build on this branch