wayland: implement jay-tray-v1

src/tree.rs

@@ -13,7 +13,7 @@ use {
                 wl_pointer::PendingScroll,
                 Dnd, NodeSeatState, WlSeatGlobal,
             },
-            wl_surface::WlSurface,
+            wl_surface::{tray::TrayItemId, WlSurface},
         },
         rect::Rect,
         renderer::Renderer,
@@ -178,6 +178,10 @@ pub trait Node: 'static {
         None
     }
 
+    fn node_tray_item(&self) -> Option<TrayItemId> {
+        None
+    }
+
     // EVENT HANDLERS
 
     fn node_on_key(