This function attaches the widget's GtkStyle to the widget's
GdkWindow. It is a replacement for
widget->style = gtk_style_attach (widget->style, widget->window);
and should only ever be called in a derived widget's "realize"
implementation which does not chain up to its parent class'
"realize" implementation, because one of the parent classes
(finally GtkWidget) would attach the style itself.
Since 2.20
This function attaches the widget's GtkStyle to the widget's GdkWindow. It is a replacement for widget->style = gtk_style_attach (widget->style, widget->window); and should only ever be called in a derived widget's "realize" implementation which does not chain up to its parent class' "realize" implementation, because one of the parent classes (finally GtkWidget) would attach the style itself. Since 2.20