Retrieves the #GActionGroup that was registered using @prefix. The resulting #GActionGroup may have been registered to @widget or any #GtkWidget in its ancestry.
If no action group was found matching @prefix, then %NULL is returned.
The “prefix” of the action group.
A #GActionGroup or %NULL.
3.16
See Implementation
Retrieves the #GActionGroup that was registered using @prefix. The resulting #GActionGroup may have been registered to @widget or any #GtkWidget in its ancestry.
If no action group was found matching @prefix, then %NULL is returned.