Inserts an action group into the list of action groups associated
with @manager. Actions in earlier groups hide actions with the same
name in later groups.
If @pos is larger than the number of action groups in @manager, or
negative, @action_group will be inserted at the end of the internal
list.
Inserts an action group into the list of action groups associated with @manager. Actions in earlier groups hide actions with the same name in later groups.
If @pos is larger than the number of action groups in @manager, or negative, @action_group will be inserted at the end of the internal list.