ComboBox:Clearable

Build 2288 on feat-combobox
Reviewing disabled
Baseline History
Build 2288a537732
Current build. There are unaccepted changes, so build 2180 is still the baseline.
Build 2180d0ed1cb current baseline
Accepted by Andrey Yamanov.
Build 2177a5b3208
Auto-accepted
Commenting is disabled because there's a newer build on this branch