Feature request: Groupoverride for submenu

[braz96]

I need to be able to clear a window property when click on a submenu item. I tried using the groupoverride to add a supplemental action as described in the docs. I couldn't get this to work though, even when omitting the group name. It would be great if I could specify submenu as the group for the override.

Thanks for considering and let me know if you need any more information!