In general I can't navigate the buttons with keyboard (tab, arrows), e.g. on the "Add User ID" dialog:
| mac | win |
Notes:
- the 3rd tab item on mac could be related to the buttons, but there's no focus feedback (maybe related to T8498: Mac Kleopatra: Buttons don't have hover feedback), and i think Enter always triggers OK
- this might also be related to T8505: Mac Kleopatra: Keyboard tab order broken

