gpui_macos: Fix deadlock during re-entrant key status changes (#51035)

Closes #50151

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Fixed a deadlock that froze the entire app when opening a new window
from a PopUp window or switching focus between multiple windows on
macOS.

crates/gpui_macos/src/window.rs

@@ -2113,10 +2113,12 @@ extern "C" fn window_did_change_key_status(this: &Object, selector: Sel, _: id)
     // in theory, we're not supposed to invoke this method manually but it balances out
     // the spurious `becomeKeyWindow` event and helps us work around that bug.
     if selector == sel!(windowDidBecomeKey:) && !is_active {
+        let native_window = lock.native_window;
+        drop(lock);
         unsafe {
-            let _: () = msg_send![lock.native_window, resignKeyWindow];
-            return;
+            let _: () = msg_send![native_window, resignKeyWindow];
         }
+        return;
     }
 
     let executor = lock.foreground_executor.clone();