Another FIXME comment in the specification for EndOfContinuousUpdates message.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2256 3789f03b-4d11-0410-bbf8-ca57d06f2519

doc/rfbtight.tex

@@ -1086,6 +1086,8 @@ Note that this message should be sent each time the client is asking
 to disable continuous updates, even if continuous updates were not
 previously enabled.
 
+FIXME: Allow unsolicited EndOfContinuousUpdates messages?
+
 See also:
 \begin{itemize}
 \item \typestr{EnableContinuousUpdates} client-to-server message.