xdg_shell: handle xdg_popup reposition signal

We are advertising xdg-shell v4, but forgot to handle this signal.

Author: emersion

xdg_shell.c

@@ -293,6 +293,7 @@ popup_handle_destroy(struct wl_listener *listener, void *data)
 	struct cg_xdg_popup *popup = wl_container_of(listener, popup, destroy);
 	wl_list_remove(&popup->destroy.link);
 	wl_list_remove(&popup->commit.link);
+	wl_list_remove(&popup->reposition.link);
 	free(popup);
 }
 
@@ -306,6 +307,14 @@ popup_handle_commit(struct wl_listener *listener, void *data)
 	}
 }
 
+static void
+popup_handle_reposition(struct wl_listener *listener, void *data)
+{
+	struct cg_xdg_popup *popup = wl_container_of(listener, popup, reposition);
+
+	popup_unconstrain(popup->xdg_popup);
+}
+
 void
 handle_new_xdg_popup(struct wl_listener *listener, void *data)
 {
@@ -350,6 +359,9 @@ handle_new_xdg_popup(struct wl_listener *listener, void *data)
 	popup->commit.notify = popup_handle_commit;
 	wl_signal_add(&wlr_popup->base->surface->events.commit, &popup->commit);
 
+	popup->reposition.notify = popup_handle_reposition;
+	wl_signal_add(&wlr_popup->events.reposition, &popup->reposition);
+
 	struct wlr_scene_tree *popup_scene_tree = wlr_scene_xdg_surface_create(parent_scene_tree, wlr_popup->base);
 	if (popup_scene_tree == NULL) {
 		wlr_log(WLR_ERROR, "Failed to allocate scene-graph node for XDG popup");

xdg_shell.h

@@ -31,6 +31,7 @@ struct cg_xdg_popup {
 
 	struct wl_listener destroy;
 	struct wl_listener commit;
+	struct wl_listener reposition;
 };
 
 void handle_new_xdg_toplevel(struct wl_listener *listener, void *data);