Specifies whether widget has a gdk.Window of its own. Note that
all realized widgets have a non-NULL “window” pointer
(Widget.getWindow never returns a NULL window when a widget
is realized), but for many of them it’s actually the gdk.Window of
one of its parent widgets. Widgets that do not create a window for
themselves in realize must announce this by
calling this function with has_window = FALSE.
This function should only be called by widget implementations,
and they should call it in their init() function.
Specifies whether widget has a gdk.Window of its own. Note that all realized widgets have a non-NULL “window” pointer (Widget.getWindow never returns a NULL window when a widget is realized), but for many of them it’s actually the gdk.Window of one of its parent widgets. Widgets that do not create a window for themselves in realize must announce this by calling this function with has_window = FALSE.
This function should only be called by widget implementations, and they should call it in their init() function.