eb6c70137b
Add set_modal ond unset_modal to the gtk_surface interface. When a surface is modal, the compositor can treat it differently from non-modal dialogs, for example attach it to the parent window if any. There is currently no changes to input device focus; it is up to the client to ignore events to the parent surface that is wanted. This bumps the gtk_shell version to 2. https://bugzilla.gnome.org/show_bug.cgi?id=745720