Sets the visual that should be used for by widget and its children for
creating gdk.Windows The visual must be on the same gdk.Screen as
returned by Widget.getScreen, so handling the
screen-changed signal is necessary.
Setting a new visual will not cause widget to recreate its windows,
so you should call this function before widget is realized.
Sets the visual that should be used for by widget and its children for creating gdk.Windows The visual must be on the same gdk.Screen as returned by Widget.getScreen, so handling the screen-changed signal is necessary.
Setting a new visual will not cause widget to recreate its windows, so you should call this function before widget is realized.