Adds @widget to @overlay.
The widget will be stacked on top of the main widget added with [method@Gtk.Overlay.set_child].
The position at which @widget is placed is determined from its [property@Gtk.Widget:halign] and [property@Gtk.Widget:valign] properties.
a GtkWidget to be added to the container
See Implementation
Adds @widget to @overlay.
The widget will be stacked on top of the main widget added with [method@Gtk.Overlay.set_child].
The position at which @widget is placed is determined from its [property@Gtk.Widget:halign] and [property@Gtk.Widget:valign] properties.