From: Po Lu <luangruo@yahoo.com>
Date: Mon, 7 Feb 2022 01:42:08 +0000 (+0800)
Subject: Correct implementation of extended frame synchronization
X-Git-Tag: emacs-29.0.90~2470
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=011fa3a4cb6407603f3a77511977b9563f3438ba;p=emacs.git

Correct implementation of extended frame synchronization

* src/xterm.c (handle_one_xevent): Use value provided in the
extended synchronization message as the current counter value.
---

diff --git a/src/xterm.c b/src/xterm.c
index 167e3a44d23..d3d8dc468cd 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -9139,7 +9139,11 @@ handle_one_xevent (struct x_display_info *dpyinfo,
 			FRAME_X_OUTPUT (f)->sync_end_pending_p = true;
 		      }
 		    else if (event->xclient.data.l[4] == 1)
-		      FRAME_X_OUTPUT (f)->ext_sync_end_pending_p = true;
+		      {
+			XSyncIntsToValue (&FRAME_X_OUTPUT (f)->current_extended_counter_value,
+					  event->xclient.data.l[2], event->xclient.data.l[3]);
+			FRAME_X_OUTPUT (f)->ext_sync_end_pending_p = true;
+		      }
 
 		    *finish = X_EVENT_DROP;
 		    goto done;