Emitted when the GdkSurface associated with @widget is destroyed.
This means that [method@Gtk.Widget.unrealize] has been called or the widget has been unmapped (that is, it is going to be hidden).
See Implementation
Emitted when the GdkSurface associated with @widget is destroyed.
This means that [method@Gtk.Widget.unrealize] has been called or the widget has been unmapped (that is, it is going to be hidden).