Implement title_format

This implements the title_format command, with a new placeholder %shell
which gets substituted with the view type (xwayland, xdg_shell_v6 or
wl_shell).

Example config:

    for_window [title=".*"] title_format %title (class=%class instance=%instance shell=%shell)

1 files changed, 1 insertions, 1 deletions

diff --git a/sway/desktop/xwayland.c b/sway/desktop/xwayland.c
index a1e672ce..b4eda71f 100644
--- a/sway/desktop/xwayland.c
+++ b/sway/desktop/xwayland.c
@@ -223,7 +223,7 @@ static void handle_commit(struct wl_listener *listener, void *data) {
         view_update_size(view, xwayland_view->pending_width,
                 xwayland_view->pending_height);
         view_damage(view, false);
-        container_update_title(view->swayc, view->wlr_xwayland_surface->title);
+        view_update_title(view, false);
 }
 
 static void handle_unmap(struct wl_listener *listener, void *data) {