bug#5984: Crash displaying composed characters

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Tue, 20 Apr 2010 19:33:56 +0200
> Cc: 5984@debbugs.gnu.org
> 
> > . Now the " *Echo Area0*" buffer holds a totally different text,
> >   unbeknownst to autocmp_chars, which still passes the old values 32
> >  and 33 to TEMP_SET_PT_BOTH:
> 
> So autocmp_chars should be made to know that after calling
> auto-composition-function, " *Echo Area0" could have been modified.

I don't know how to do that, in the middle of composing characters.
Perhaps Handa-san (cc'ed) could help.