server: Post a message to the desktop window when the cursor clip rectangle changes.
diff --git a/server/protocol.def b/server/protocol.def
index f8fc82b..8aaf2d3 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -3318,6 +3318,7 @@
     int            x;             /* cursor position */
     int            y;
     rectangle_t    clip;          /* cursor clip rectangle */
+    unsigned int   clip_msg;      /* message to post on cursor clip changes */
 @REPLY
     user_handle_t  prev_handle;   /* previous handle */
     int            prev_count;    /* previous show count */