bug#3174: NS: greek glyph rendering incoherent

[Adrian Robert]

On May 31, 2009, at 9:05 PM, David Reitter wrote:

> With your patch, Emacs -Q crashes when doing M-x view-hello-file.
> ...
> (gdb) bt
> #0  0x0020d208 in ns_charset_covers (set1=0x0, set2=0x16982a0,  
> pct=0.899999976) at nsfont.m:271

This is the problem (set1=0x0).  I only have access to Tiger here, so  
I'm not sure if it's something with Leopard, or specific to a font on  
your system, but [font coveredCharacterSet] must be returning nil.   
If you can go up one (ns_get_covering_families) and run 'print-object  
family' you can see what the offending family is.

I'm not sure what to do about this.  If it's only for some fonts I  
guess we can just assume they cover ASCII only.  If it is for every  
font on Leopard, then the whole approach will need to be reconsidered.