[Fontconfig] How to block glyph fallback in a QT application?

[Janusz S. Bien]

The problem of the glyph fallback has been already discussed on the  
list, but in the context of Pango.

We have a QT application

https://bitbucket.org/mrudolf/djview-poliqarp

used to display historical texts with a lot of ligatures and some PUA  
characters form Medieval Unicode Font Initiative. If the user  
incidentally selects an improper font, then fallback creates quite a  
mess.

In

http://lists.freedesktop.org/archives/fontconfig/2012-December/004490.html

there is a statement:

"there are no way to do that in fontconfig so far and a RFE is
in Bugzilla long while."

There is still no way to do it in fontconfig?

Which RFE is referred to in the post?

I would appreciate very much your comments and suggestions.

Best regards

Janusz

-- 
Prof. dr hab. Janusz S. Bień -  Uniwersytet Warszawski (Katedra  
Lingwistyki Formalnej)
Prof. Janusz S. Bień - University of Warsaw (Formal Linguistics Department)
jsbien at uw.edu.pl, jsbien at mimuw.edu.pl, http://fleksem.klf.uw.edu.pl/~jsbien/