Checkboxes that are inside frames do not fill the width of a dock
Environment/Versions
- GIMP version: git master
- Operating System: Linux
Description of the bug
As a regression from 2.10, checkboxes inside frames do not expand to fill the width of of a dock, but straight checkboxes still do. So the behaviour is not consistent.
An example would be the checkboxes inside the Paintbrush tool options dock. "Incremental" and "Lock brush to view" fill the full width of the dock, but the others that expand when enabled do not.