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Improve gtk_widget_insert_action_group docs
Mention that group can be NULL. Related to https://bugzilla.gnome.org/show_bug.cgi?id=708150
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@ -15520,13 +15520,16 @@ _gtk_widget_get_action_muxer (GtkWidget *widget)
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* gtk_widget_insert_action_group:
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* @widget: a #GtkWidget
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* @name: the prefix for actions in @group
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* @group: a #GActionGroup
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* @group: (allow-none): a #GActionGroup, or %NULL
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*
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* Inserts @group into @widget. Children of @widget that implement
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* #GtkActionable can then be associated with actions in @group by
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* setting their 'action-name' to
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* @prefix.<replaceable>action-name</replaceable>.
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*
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* If @group is %NULL, a previously inserted group for @name is removed
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* from @widget.
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*
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* Since: 3.6
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*/
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void
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