[macOS] Fix missing mouse exit events on window close.

platform/macos/display_server_macos.h

@@ -171,6 +171,7 @@ private:
 	int current_layout = 0;
 	bool keyboard_layout_dirty = true;
 
+	WindowID window_mouseover_id = INVALID_WINDOW_ID;
 	WindowID last_focused_window = INVALID_WINDOW_ID;
 	WindowID window_id_counter = MAIN_WINDOW_ID;
 	float display_max_scale = 1.f;
@@ -240,6 +241,8 @@ public:
 	bool get_is_resizing() const;
 	void reparent_check(WindowID p_window);
 	WindowID _get_focused_window_or_popup() const;
+	void mouse_enter_window(WindowID p_window);
+	void mouse_exit_window(WindowID p_window);
 
 	void window_update(WindowID p_window);
 	void window_destroy(WindowID p_window);

platform/macos/display_server_macos.mm

@@ -366,6 +366,25 @@ DisplayServer::WindowID DisplayServerMacOS::_get_focused_window_or_popup() const
 	return last_focused_window;
 }
 
+void DisplayServerMacOS::mouse_enter_window(WindowID p_window) {
+	if (window_mouseover_id != p_window) {
+		if (window_mouseover_id != INVALID_WINDOW_ID) {
+			send_window_event(windows[window_mouseover_id], WINDOW_EVENT_MOUSE_EXIT);
+		}
+		window_mouseover_id = p_window;
+		if (p_window != INVALID_WINDOW_ID) {
+			send_window_event(windows[p_window], WINDOW_EVENT_MOUSE_ENTER);
+		}
+	}
+}
+
+void DisplayServerMacOS::mouse_exit_window(WindowID p_window) {
+	if (window_mouseover_id == p_window && p_window != INVALID_WINDOW_ID) {
+		send_window_event(windows[p_window], WINDOW_EVENT_MOUSE_EXIT);
+	}
+	window_mouseover_id = INVALID_WINDOW_ID;
+}
+
 void DisplayServerMacOS::_dispatch_input_events(const Ref<InputEvent> &p_event) {
 	((DisplayServerMacOS *)(get_singleton()))->_dispatch_input_event(p_event);
 }
@@ -2069,9 +2088,7 @@ void DisplayServerMacOS::mouse_set_mode(MouseMode p_mode) {
 
 	if (show_cursor && !previously_shown) {
 		window_id = get_window_at_screen_position(mouse_get_position());
-		if (window_id != INVALID_WINDOW_ID) {
-			send_window_event(windows[window_id], WINDOW_EVENT_MOUSE_ENTER);
-		}
+		mouse_enter_window(window_id);
 	}
 
 	if (p_mode == MOUSE_MODE_CAPTURED) {

platform/macos/godot_content_view.mm

@@ -505,9 +505,8 @@
 		return;
 	}
 
-	DisplayServerMacOS::WindowData &wd = ds->get_window(window_id);
 	if (ds->mouse_get_mode() != DisplayServer::MOUSE_MODE_CAPTURED) {
-		ds->send_window_event(wd, DisplayServerMacOS::WINDOW_EVENT_MOUSE_EXIT);
+		ds->mouse_exit_window(window_id);
 	}
 }
 
@@ -517,9 +516,8 @@
 		return;
 	}
 
-	DisplayServerMacOS::WindowData &wd = ds->get_window(window_id);
 	if (ds->mouse_get_mode() != DisplayServer::MOUSE_MODE_CAPTURED) {
-		ds->send_window_event(wd, DisplayServerMacOS::WINDOW_EVENT_MOUSE_ENTER);
+		ds->mouse_enter_window(window_id);
 	}
 
 	ds->cursor_update_shape();

platform/macos/godot_window_delegate.mm

@@ -67,6 +67,7 @@
 		ds->window_set_transient(window_id, DisplayServerMacOS::INVALID_WINDOW_ID);
 	}
 
+	ds->mouse_exit_window(window_id);
 	ds->window_destroy(window_id);
 }