HdyComboRow popup is not keyboard navigatable
- Select a combo row
- Hit Enter or Space to open the popup
- Try to navigate
- Navigation fails and popup closes
- Navigation works and I can select an item using the keyboard
NOTE: The current approach uses a GtkListBox internally, which is somewhat bad because we need to reset the lists background, potentially breaking assumptions from themes (i.e. the "list" style class should never be applied instead of overriding the CSS).