bug#33640: 27.0.50; Wrong column when prompt contains combining characters

[Eli Zaretskii]

> Date: Thu, 06 Dec 2018 09:02:37 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 33640@debbugs.gnu.org
> 
> The success criterion is that minibuffer navigation works with these
> characters not worse than C-n/C-p in "normal" buffers.

Just to explain this part a bit more: on GUI frames, double-width
characters are not necessarily displayed at twice the width of other
characters from the same font; their actual width in pixels varies
with fonts.  This could cause one-column shifts in either direction
when using C-n/C-p across such characters.  I'm saying that what you
see in the minibuffer should be not worse than what you see in
"normal" buffers for those characters.