Xi: Don't emit a TouchEnd event to a frozen device

EmitTouchEnd calls DeliverTouchEvents directly instead of through
public.processInputProc. If a device is frozen, the TouchEnd is
processed while the device is waiting for a XAllowEvents and thus ends the
touch point (and the grab) before the client decided what to do with it. In
the case of ReplayPointer, this loses the event.

This is a hack, but making EmitTouchEnd use processInputProc breaks
approximately everything, especially the touch point is cleaned up during
ProcessTouchEvents. Working around that is a bigger hack than this.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

Xi/exevents.c

@@ -1067,6 +1067,10 @@ EmitTouchEnd(DeviceIntPtr dev, TouchPointInfoPtr ti, int flags, XID resource)
 {
     InternalEvent event;
 
+    /* We're not processing a touch end for a frozen device */
+    if (dev->deviceGrab.sync.frozen)
+        return;
+
     flags |= TOUCH_CLIENT_ID;
     if (ti->emulate_pointer)
         flags |= TOUCH_POINTER_EMULATED;