Comment 16 for bug 595432

As vaifrax points out: pango-font-description-to-string adds a trailing comma to a family name when the last word in a family list is a valid style attribute. See:

http://developer.gnome.org/pango/stable/pango-Fonts.html#pango-font-description-to-string

This is to prevent confusion between:

Aller Light, (Aller Light family) and
Aller LIght (Aller family with a light weight).

Simply stripping off the comma may work in practice, but we should be aware that it may make break things elsewhere. At least a comment should be added to the patch explaining why the comma is being stripped.

In the long run, it might be better to do the opposite, add a hidden comma to Aller LIght (etc.) when it is typed into the font selection drop-down.