bug#12745: crash in bidi_pop_it during (idle) redisplay

[Eli Zaretskii]

> Date: Mon, 29 Oct 2012 15:09:22 -0400
> From: Alp Aker <alptekin.aker@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, 12745@debbugs.gnu.org
> 
> > That string is likely also from fci-mode.  The overlay string that
> > mode puts at the end of each line has the structure <character> +
> > <stretch glyph> + <image>, where by default <character> is U+E000.  It
> > shouldn't be null.
> 
> And if I'm reading things right, the display table entry for U+E000
> should be [32] in this situation.

Out of curiosity: what is the purpose of having in an overlay this
weird character and then to display it as a space?