all: fix memory leaks

src/tree/display.rs

@@ -32,6 +32,10 @@ impl DisplayNode {
         }
     }
 
+    pub fn clear(&self) {
+        self.outputs.clear();
+    }
+
     pub fn update_extents(&self) {
         let outputs = self.outputs.lock();
         let mut x1 = i32::MAX;

src/tree/output.rs

@@ -41,6 +41,15 @@ pub struct OutputNode {
 }
 
 impl OutputNode {
+    pub fn clear(&self) {
+        self.global.clear();
+        self.workspace.set(None);
+        let workspaces: Vec<_> = self.workspaces.iter().collect();
+        for workspace in workspaces {
+            workspace.clear();
+        }
+    }
+
     pub fn update_render_data(&self) {
         let mut rd = self.render_data.borrow_mut();
         rd.titles.clear();

src/tree/workspace.rs

@@ -33,6 +33,12 @@ pub struct WorkspaceNode {
 }
 
 impl WorkspaceNode {
+    pub fn clear(&self) {
+        self.container.set(None);
+        self.output_link.set(None);
+        self.fullscreen.set(None);
+    }
+
     pub fn set_container(self: &Rc<Self>, container: &Rc<ContainerNode>) {
         let pos = self.position.get();
         container.clone().tl_change_extents(&pos);