dix: Don't interfere grabs the interfering device is of different type.

A pointer device should be able to send events while the client has a core
grab on a keyboard device, and likewise.

dix/events.c

@@ -6206,6 +6206,8 @@ IsInterferingGrab(ClientPtr client, DeviceIntPtr dev, xEvent* event)
             if (it->deviceGrab.grab && SameClient(it->deviceGrab.grab, client)
                         && !it->deviceGrab.fromPassiveGrab)
             {
+                if ((IsPointerDevice(it) && IsPointerDevice(dev)) ||
+                        (IsKeyboardDevice(it) && IsKeyboardDevice(dev)))
                     return TRUE;
             }
         }