From 05bf09ea4aa5a7dc22869075ea2096c4a293d70d Mon Sep 17 00:00:00 2001
From: Jeff Smith <whydoubt@gmail.com>
Date: Wed, 31 Jan 2018 23:27:19 -0600
Subject: [PATCH] backends/x11: Fix time-comparison bug causing hang

A comparison in translate_device_event() does not account for the fact
that X's clock wraps about every 49.7 days.  When triggered, this causes
an unresponsive GUI.

Replace simple less-than comparison with XSERVER_TIME_IS_BEFORE macro,
which accounts for the wrapping of X's clock.

Closes: https://gitlab.gnome.org/GNOME/mutter/issues/12
---
 src/backends/x11/meta-backend-x11.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backends/x11/meta-backend-x11.c b/src/backends/x11/meta-backend-x11.c
index 233532435..f447f785f 100644
--- a/src/backends/x11/meta-backend-x11.c
+++ b/src/backends/x11/meta-backend-x11.c
@@ -112,7 +112,7 @@ translate_device_event (MetaBackendX11 *x11,
 
   if (!device_event->send_event && device_event->time != CurrentTime)
     {
-      if (device_event->time < priv->latest_evtime)
+      if (XSERVER_TIME_IS_BEFORE (device_event->time, priv->latest_evtime))
         {
           /* Emulated pointer events received after XIRejectTouch is received
            * on a passive touch grab will contain older timestamps, update those
-- 
2.17.1