ComboBox:Opens with manual trigger showing a list

Build 148 on beta-release
Reviewing disabled
The baseline is wider than the new snapshot (1169x901 to 1154x901).
Baseline History
Build 1486d7b6c6 current baseline
Current build. Accepted by sarahgm.
Build 1126e78c07
Accepted by Marcel Köhler.
Build 103c86edf9
Accepted by Marcel Köhler.
Commenting is disabled because there's a newer build on this branch