xdg-shell: reset added/committed flag on unmap

When a client attaches a NULL buffer to its wl_surface, it's
unmapped. This resets the xdg_surface in its initial state. An
extra NULL commit makes the compositor send an initial configure
event.

Note, wlr_xdg_toplevel.added is separate from wlr_xdg_surface.added.

Closes: https://github.com/swaywm/sway/issues/7397

types/xdg_shell/wlr_xdg_popup.c

@@ -449,6 +449,8 @@ void unmap_xdg_popup(struct wlr_xdg_popup *popup) {
 
 		popup->seat = NULL;
 	}
+
+	popup->committed = false;
 }
 
 void destroy_xdg_popup(struct wlr_xdg_popup *popup) {

types/xdg_shell/wlr_xdg_toplevel.c

@@ -535,6 +535,8 @@ void unmap_xdg_toplevel(struct wlr_xdg_toplevel *toplevel) {
 	toplevel->requested.fullscreen = false;
 	toplevel->requested.maximized = false;
 	toplevel->requested.minimized = false;
+
+	toplevel->added = false;
 }
 
 void destroy_xdg_toplevel(struct wlr_xdg_toplevel *toplevel) {