bug#23292: 24.5; Combining characters do not reliably combine

[Eli Zaretskii]

> From: Alexis <flexibeast@gmail.com>
> Cc: Kenichi Handa <handa@gnu.org>, hdfssk@gmail.com, 23292@debbugs.gnu.org
> Date: Fri, 15 Apr 2016 19:03:15 +1000
> 
> My apologies, i accidentally used a non -Q instance to test 
> this. :-/ In a -Q instance, it turns out that DejaVu Sans Mono 
> (Book) /does/ compose visually:

Can you show a screenshot?

> Composed with the following character(s) "̷" using this font: 
>   xft:-unknown-DejaVu Sans 
>   Mono-normal-normal-normal-*-13-*-*-*-m-0-iso10646-1 
> by these glyphs: 
>   [0 1 111 82 8 0 8 8 1 nil] [0 1 823 703 0 0 8 8 1 [-8 0 0]] 
> 
> Sorry!
> 
> However, Inconsolata-g definitely doesn't compose visually.
> 
> Interestingly, when i use `describe-char' on the 'o', i'm told 
> that the glyph is sourced from Inconsolata-g, but when i use it on 
> the '/', it tells me it's sourced from Gentium ....

Something with your fonts and fontsets, I guess.  If you force Emacs
to use Inconsolata-g for "̷", does the composition happen?

Thanks.