Indicates to the window manager that @surface is a transient
dialog associated with the application surface @parent. This
allows the window manager to do things like center @surface
on @parent and keep @surface above @parent.
See [method@Gtk.Window.set_transient_for] if you’re using
[class@Gtk.Window] or [class@Gtk.Dialog].
Sets a transient-for parent.
Indicates to the window manager that @surface is a transient dialog associated with the application surface @parent. This allows the window manager to do things like center @surface on @parent and keep @surface above @parent.
See [method@Gtk.Window.set_transient_for] if you’re using [class@Gtk.Window] or [class@Gtk.Dialog].