ComboBox:Clearable

Build 2286 on feat-combobox
Reviewing disabled
Baseline History
Build 22868169c0d
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