all: fix memory leaks

src/tree/display.rs

@@ -34,6 +34,7 @@ impl DisplayNode {
 
     pub fn clear(&self) {
         self.outputs.clear();
+        self.seat_state.clear();
     }
 
     pub fn update_extents(&self) {

src/tree/output.rs

@@ -57,6 +57,7 @@ impl OutputNode {
         for workspace in workspaces {
             workspace.clear();
         }
+        self.render_data.borrow_mut().titles.clear();
     }
 
     pub fn on_spaces_changed(self: &Rc<Self>) {