Get the #GdkDisplay for the toplevel window associated with
this widget. This function can only be called after the widget
has been added to a widget hierarchy with a #GtkWindow at the top.
In general, you should only create display specific
resources when a widget has been realized, and you should
free those resources when the widget is unrealized.
Return: the #GdkDisplay for the toplevel for this widget.
Get the #GdkDisplay for the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a #GtkWindow at the top.
In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.
Return: the #GdkDisplay for the toplevel for this widget.