[PATCH v2] DIX/Xi: Pass correct client to CheckDeviceGrabAndHintWindow()

[Egbert Eich]

If we have a client which has registered for a DeviceButton grab
be sure to pass this to CheckDeviceGrabAndHintWindow(). Since the
order of clients is arbitrary there is no guarantee that the last
client in the list is the one that belongs to this class.

Signed-off-by: Egbert Eich <eich at freedesktop.org>
---
v2: Coding style fixes, added comment to code as suggested by
    Peter Hutterer <peter.hutterer at who-t.net>

 dix/events.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/dix/events.c b/dix/events.c
index 40673ce..3572dc5 100644
--- a/dix/events.c
+++ b/dix/events.c
@@ -2149,6 +2149,7 @@ DeliverEventToInputClients(DeviceIntPtr dev, InputClients * inputclients,
 {
     int attempt;
     enum EventDeliveryState rc = EVENT_NOT_DELIVERED;
+    Bool have_device_button_grab_class_client = FALSE;
 
     for (; inputclients; inputclients = inputclients->next) {
         Mask mask;
@@ -2168,13 +2169,21 @@ DeliverEventToInputClients(DeviceIntPtr dev, InputClients * inputclients,
                                             events, count,
                                             mask, filter, grab))) {
             if (attempt > 0) {
-                rc = EVENT_DELIVERED;
-                *client_return = client;
-                *mask_return = mask;
-                /* Success overrides non-success, so if we've been
-                 * successful on one client, return that */
-            }
-            else if (rc == EVENT_NOT_DELIVERED)
+                /*
+                 * The order of clients is arbitrary therefore if one
+                 * client belongs to DeviceButtonGrabClass make sure to
+                 * catch it.
+                 */
+                if (!have_device_button_grab_class_client) {
+                    rc = EVENT_DELIVERED;
+                    *client_return = client;
+                    *mask_return = mask;
+                    /* Success overrides non-success, so if we've been
+                     * successful on one client, return that */
+                    if (mask & DeviceButtonGrabMask)
+                        have_device_button_grab_class_client = TRUE;
+                }
+            } else if (rc == EVENT_NOT_DELIVERED)
                 rc = EVENT_REJECTED;
         }
     }
-- 
1.8.1.4