Sets the last widget in the info bar's action area with
the given response_id as the default widget for the dialog.
Pressing "Enter" normally activates the default widget.
Note that this function currently requires info_bar to
be added to a widget hierarchy.
Since 2.18
Sets the last widget in the info bar's action area with the given response_id as the default widget for the dialog. Pressing "Enter" normally activates the default widget. Note that this function currently requires info_bar to be added to a widget hierarchy. Since 2.18