Emitted when @widget is associated with a GdkSurface.
This means that [method@Gtk.Widget.realize] has been called or the widget has been mapped (that is, it is going to be drawn).
See Implementation
Emitted when @widget is associated with a GdkSurface.
This means that [method@Gtk.Widget.realize] has been called or the widget has been mapped (that is, it is going to be drawn).