fix compositor edge cases, process handing and other cool improvements

compositor/src/state/outputs.rs

@@ -111,8 +111,6 @@ impl Ferese {
                 true
             }
         });
-        self.session_lock.surfaces.remove(output);
-        self.session_lock.backgrounds.remove(output);
         self.session_lock.output_removed(output);
     }