emacs-31 2b47d719225: Backport: Fix freeze in NS event handling (bug#81510)

branch: emacs-31
commit 2b47d71922528ec142bc77fca4e02fbe789267f5
Author: Alan Third <[email protected]>
Commit: Alan Third <[email protected]>

    Backport: Fix freeze in NS event handling (bug#81510)
    
    * src/nsterm.m (EV_TRAILER): Don't queue event if it's of kind
    'NO_EVENT'.
---
 src/nsterm.m | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/nsterm.m b/src/nsterm.m
index 120442cda25..a5273e93272 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -446,10 +446,11 @@ ev_modifiers_helper (unsigned int flags, unsigned int left_mask,
 /* This is a piece of code which is common to all the event handling
    methods.  Maybe it should even be a function.  */
 #define EV_TRAILER(e)						\
-  {								\
-    XSETFRAME (emacs_event->frame_or_window, emacsframe);	\
-    EV_TRAILER2 (e);						\
-  }
+  if (emacs_event->kind != NO_EVENT)				\
+    {								\
+      XSETFRAME (emacs_event->frame_or_window, emacsframe);	\
+      EV_TRAILER2 (e);						\
+    }
 
 #define EV_TRAILER2(e)                                                  \
   {                                                                     \