Sorry I'm late joining this conversation, but it was sufficiently annoying to me today that I searched for information about it and found this thread.
I agree completely with Trevor. If you are serious about "what you see is what you mean" and "LyX lets you concentrate on writing" (from http://www.lyx.org/WhatIsLyX ), the message should not be displayed. Alan cardcloud.com/alanb On Apr 15, 2012, at 3:59 PM, Trevor Jenkins <bslwann...@gmail.com> wrote: if the key sequence has no meaning in LyX then I'd argue that there is absolutely no need for a message at all. Just have it drop the second space quietly and move on.