improvement on xdg request handles

diyac.h

@@ -12,6 +12,7 @@
 #include <wlr/types/wlr_subcompositor.h>
 #include <wlr/types/wlr_data_device.h>
 #include <wlr/types/wlr_output_layout.h>
+#include <wlr/types/wlr_fractional_scale_v1.h>
 
 #define LAYER_TREE_SZ 4
 /* For brevity's sake, struct members are annotated where they are used. */
@@ -106,6 +107,7 @@ struct diyac_server
     struct wl_listener new_xdg_surface;
     struct wl_listener new_layer_surface;
     struct wl_list views;
+
     /*
      * Popups need to be rendered above always-on-top views, so we reparent
      * them to this dedicated tree
@@ -180,7 +182,7 @@ struct diyac_view
     struct wl_listener request_maximize;
     struct wl_listener request_fullscreen;
 
-    struct wl_listener set_app_id;
+    struct wl_listener set_app_id; // only useful when using SSD
     struct wl_listener new_popup;
 };