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

["Jan Djärv" <jan.h.d@swipnet.se>]

Hello.

7 sep 2013 kl. 11:59 skrev Eli Zaretskii <eliz@gnu.org>:

>> From: Jan Djärv <jan.h.d@swipnet.se>
>> Date: Sat, 7 Sep 2013 10:54:58 +0200
>> Cc: xfq.free@gmail.com,
>> 15273@debbugs.gnu.org
>> 
>> Except the larger bug that Emacs does not handle combining characters correctly in the general case, i.e. not combining the ! and the triangle on X11 and W32 (and Mac port).
> 
> Is there any application out there that does combine these 2
> characters, with any font?  If not, perhaps it's not an Emacs issue
> after all.

Yes, the builtin TextEdit application does it.

> 
> E.g., Code2000, which is really good, produces a composed character
> for a followed by u+20d0, but not for a followed by u+20e4.  You can
> experiment with other combining diacriticals from that Unicode block,
> and you will see that some of them combine, while others do not.
> 
> If the fonts do not tell us to combine characters, the only way to do
> that is to provide an Emacs composition rule for those characters.
> 
>> And if it is a bug in the NS font driver, that is also an Emacs issue.  There must be one, either metrics should be corrected or the NS font driver should be modified to behave in the same (incorrect) way as the other platforms.
> 
> If you mean the incorrect display of the lone u+20e4, then I just
> installed the STIX fonts (from
> http://sourceforge.net/projects/stixfonts/files/?source=navbar) on my
> Windows box, and didn't see any problems as originally reported here.
> Can you install the latest STIX fonts and try with that on NS?  If the
> problem persists, then I agree that nsfont.m is probably the culprit.

The behaviour iis the same with that STIX version as it is with the OSX supplied STIX version.

	Jan D.