Allow merging menus with same name

[Natureshadow]

If several apps declare a menu item with the same name, and the item has a submenu, it would be good to merge the two menus together into one. That way, apps cann add menu entries to existing submenues.

It would also be possible to enable or disable merging with an additional attribute.

[MiltonLn]

This is a good idea, we'll work it out.

[debdolph]

Any progress on this?