Causes widget to become the default widget. widget must be able to be
a default widget; typically you would ensure this yourself
by calling gtk.widget.Widget.setCanDefault with a true value.
The default widget is activated when
the user presses Enter in a window. Default widgets must be
activatable, that is, gtk.widget.Widget.activate should affect them. Note
that #GtkEntry widgets require the “activates-default” property
set to true before they activate the default widget when Enter
is pressed and the #GtkEntry is focused.
Causes widget to become the default widget. widget must be able to be a default widget; typically you would ensure this yourself by calling gtk.widget.Widget.setCanDefault with a true value. The default widget is activated when the user presses Enter in a window. Default widgets must be activatable, that is, gtk.widget.Widget.activate should affect them. Note that #GtkEntry widgets require the “activates-default” property set to true before they activate the default widget when Enter is pressed and the #GtkEntry is focused.