Set window's edited = true when there are unsaved changes

crates/gpui/src/platform/mac/window.rs

@@ -397,6 +397,17 @@ impl platform::Window for Window {
             msg_send![app, changeWindowsItem:window title:title filename:false]
         }
     }
+
+    fn set_edited(&mut self, edited: bool) {
+        unsafe {
+            let window = self.0.borrow().native_window;
+            msg_send![window, setDocumentEdited: edited as BOOL]
+        }
+
+        // Changing the document edited state resets the traffic light position,
+        // so we have to move it again.
+        self.0.borrow().move_traffic_light();
+    }
 }
 
 impl platform::WindowContext for Window {

crates/gpui/src/platform/test.rs

@@ -38,6 +38,7 @@ pub struct Window {
     resize_handlers: Vec<Box<dyn FnMut()>>,
     close_handlers: Vec<Box<dyn FnOnce()>>,
     pub(crate) title: Option<String>,
+    pub(crate) edited: bool,
     pub(crate) pending_prompts: RefCell<VecDeque<oneshot::Sender<usize>>>,
 }
 
@@ -191,6 +192,7 @@ impl Window {
             scale_factor: 1.0,
             current_scene: None,
             title: None,
+            edited: false,
             pending_prompts: Default::default(),
         }
     }
@@ -258,6 +260,10 @@ impl super::Window for Window {
     fn set_title(&mut self, title: &str) {
         self.title = Some(title.to_string())
     }
+
+    fn set_edited(&mut self, edited: bool) {
+        self.edited = edited;
+    }
 }
 
 pub fn platform() -> Platform {