Remove the code for subgrouping the actions in a action collection with special named actions ("Group:").

It assumes actions in a collection keep the order they where inserted.
That's not true anymore since the KKeyChooser -> KShortcutsDialog redesign.

It doesn't work with global shortcuts either.
kwin is the only user of that functionality I found.

We have to find a way to provide that functionality differently.
For the reason have a look at kates "configure shortcuts" dialog.

Anyone an idea? I think of creating something like KActionGroups.