bug#15273: 24.3.50; Combining character sequences are displayed weirdly

[Kenichi Handa]

In article <834n9vl5q1.fsf@gnu.org>, Eli Zaretskii <eliz@gnu.org> writes:

>> Next, I'm not sure whether Emacs composes them correctly if
>> the underlying font driver doesn't support OTF's "mark" and
>> "mkmk" features.  The function compose-gstring-for-graphic
>> has a code for such a case, but I don't remember that I
>> wrote a code for "enclosing combining marks".

> Looks like Uniscribe should need this, at least on XP: I do get a
> composition, but the left part of the triangle is off-screen.

I saw the same rendering on GNU/Linux with a font
which doesn't have a proper feature for U+20E4.  I'm now
investigating how to improve compose-gstring-for-graphic.

---
Kenichi Handa
handa@gnu.org