On macOS, fix deadlock during nested event loops (e.g. rfd)

CHANGELOG.md

@@ -12,6 +12,7 @@ Unreleased` header.
 # Unreleased
 
 - On Windows, fix deadlock when accessing the state during `Cursor{Enter,Leave}`.
+- On macOS, fix deadlock when entering a nested event loop from an event handler.
 
 # 0.29.2
 

src/platform_impl/macos/app_state.rs

@@ -494,9 +494,9 @@ impl AppState {
 
         // Return when in callback due to https://github.com/rust-windowing/winit/issues/1779
         if panic_info.is_panicking()
+            || HANDLER.get_in_callback()
             || !HANDLER.have_callback()
             || !HANDLER.is_running()
-            || HANDLER.get_in_callback()
         {
             return;
         }
@@ -601,9 +601,9 @@ impl AppState {
         // XXX: how does it make sense that `get_in_callback()` can ever return `true` here if we're
         // about to return to the `CFRunLoop` to poll for new events?
         if panic_info.is_panicking()
+            || HANDLER.get_in_callback()
             || !HANDLER.have_callback()
             || !HANDLER.is_running()
-            || HANDLER.get_in_callback()
         {
             return;
         }