From 78d09336391faf6e3fe9f67771b03114f23c0b7c Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Thu, 2 Jan 2014 21:33:30 +0100
Subject: [PATCH] Xi: Ensure DeviceChanged is emitted after grabs are
 deactivated

When a grab on a slave device is deactivated, the master device must
be checked, just in case there were events from other devices while
the slave device was stolen away by the passive grab. This may
introduce misbehaviors on mismatching valuators and device features
later on UpdateDeviceState().

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit b2d5ee2e3684951b611fd2068d57cc65fd8305a3)
---
 Xi/exevents.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/Xi/exevents.c b/Xi/exevents.c
index ed6dc36..6b9561e 100644
--- a/Xi/exevents.c
+++ b/Xi/exevents.c
@@ -1783,8 +1783,25 @@ ProcessDeviceEvent(InternalEvent *ev, DeviceIntPtr device)
         DeliverDeviceEvents(GetSpriteWindow(device), (InternalEvent *) event,
                             NullGrab, NullWindow, device);
 
-    if (deactivateDeviceGrab == TRUE)
+    if (deactivateDeviceGrab == TRUE) {
         (*device->deviceGrab.DeactivateGrab) (device);
+
+        if (!IsMaster (device) && !IsFloating (device)) {
+            int flags, num_events = 0;
+            InternalEvent dce;
+
+            flags = (IsPointerDevice (device)) ?
+                DEVCHANGE_POINTER_EVENT : DEVCHANGE_KEYBOARD_EVENT;
+            UpdateFromMaster (&dce, device, flags, &num_events);
+            BUG_WARN(num_events > 1);
+
+            if (num_events == 1)
+                ChangeMasterDeviceClasses(GetMaster (device, MASTER_ATTACHED),
+                                          &dce.changed_event);
+        }
+
+    }
+
     event->detail.key = key;
 }
 
-- 
1.9.0