[matplotlib-devel] get_fontconfig_fonts

Because of the problem described here:

http://thread.gmane.org/gmane.comp.python.matplotlib.general/20328

I modified font_manager.py to use subprocess.Popen instead of
commands.getstatusoutput, since subprocess seems to deal with EINTR
while the commands module does not. While looking at it, I changed the
command being run from

fc-list file

to

fc-list '' file

because the former doesn't return any fonts on any system I have access
to (maybe it would if I had a font whose name includes the word "file"),
but the latter looks more like it is the intended command. Since the
get_fontconfig_fonts function has not returned anything useful for some
time (though presumably it has at some point in the past), this change
might have big effects somewhere else.

Would this change be appropriate for the bugfix branch?

-- 
Jouni K. Seppänen
http://www.iki.fi/jks