appkit: patch a unit test issue in monitor.rs regarding display ID.

On macOS, make AppKit monitor handle tests derive their reference display IDs from
  `CGMainDisplayID`, preventing failures on systems where the primary monitor is not display `1`.

Author: ShikiSuen

winit-appkit/src/monitor.rs

@@ -352,8 +352,10 @@ mod tests {
 
     #[test]
     fn uuid_stable() {
-        let handle_a = MonitorHandle::new(1).unwrap();
-        let handle_b = MonitorHandle::new(1).unwrap();
+        let primary_id = CGMainDisplayID();
+
+        let handle_a = MonitorHandle::new(primary_id).unwrap();
+        let handle_b = MonitorHandle::new(primary_id).unwrap();
         assert_eq!(handle_a, handle_b);
         assert_eq!(handle_a.display_id(), handle_b.display_id());
         assert_eq!(handle_a.uuid(), handle_b.uuid());
@@ -368,8 +370,10 @@ mod tests {
     /// Test the MonitorHandle::new fallback.
     #[test]
     fn monitorhandle_from_zero() {
+        let primary_id = CGMainDisplayID();
+
         let handle0 = MonitorHandle::new(0).unwrap();
-        let handle1 = MonitorHandle::new(1).unwrap();
+        let handle1 = MonitorHandle::new(primary_id).unwrap();
         assert_eq!(handle0, handle1);
         assert_eq!(handle0.display_id(), handle1.display_id());
         assert_eq!(handle0.uuid(), handle1.uuid());

winit/src/changelog/unreleased.md

@@ -264,6 +264,8 @@ changelog entry.
 - On macOS, fixed redundant `SurfaceResized` event at window creation.
 - On macOS, don't panic on monitors with unknown bit-depths.
 - On macOS, fixed crash when closing the window on macOS 26+.
+- On macOS, make AppKit monitor handle tests derive their reference display IDs from
+  `CGMainDisplayID`, preventing failures on systems where the primary monitor is not display `1`.
 - On Windows, account for mouse wheel lines per scroll setting for `WindowEvent::MouseWheel`.
 - On Windows, `Window::theme` will return the correct theme after setting it through `Window::set_theme`.
 - On Windows, `Window::set_theme` will change the title bar color immediately now.