KToolBarPopupAction: Use the menu from menu() if set
Unlike my initial assumptions, there's valid use cases for using
KToolBarPopupAction
with a custom regular menu: If you place a
QAction
in a toolbar, it becomes a "split" button. There's no
way to influence that other than using this action class instead.
Gwenview does that and doesn’t even place it in a menu, so I thought it could just use a regular QAction
but obviously it couldn’t.