Make popup inert when destroyed.

types/xdg_shell/wlr_xdg_popup.c

@@ -285,7 +285,8 @@ void destroy_xdg_popup(struct wlr_xdg_surface *xdg_surface) {
 	if (xdg_surface == NULL) {
 		return;
 	}
-	assert(xdg_surface->role == WLR_XDG_SURFACE_ROLE_POPUP);
+	assert(xdg_surface->role == WLR_XDG_SURFACE_ROLE_POPUP ||
+		xdg_surface->role == WLR_XDG_SURFACE_ROLE_NONE);
 	reset_xdg_surface(xdg_surface);
 }
 

types/xdg_shell/wlr_xdg_surface.c

@@ -524,9 +524,14 @@ void wlr_xdg_toplevel_send_close(struct wlr_xdg_surface *surface) {
 }
 
 void wlr_xdg_popup_destroy(struct wlr_xdg_surface *surface) {
+	if (surface == NULL) {
+		return;
+	}
 	assert(surface->popup);
 	assert(surface->role == WLR_XDG_SURFACE_ROLE_POPUP);
 	xdg_popup_send_popup_done(surface->popup->resource);
+	wl_resource_set_user_data(surface->popup->resource, NULL);
+	destroy_xdg_popup(surface);
 }
 
 static void xdg_popup_get_position(struct wlr_xdg_popup *popup,