There’s a Qt5 application that I use to render text on screen and to PDF.
I’ve been having trouble with newer fonts automatically creating ligatures from e.g. ff (which is plain wrong, ① because U+FB00 ff exists for this purpose, and ② because this will also wrongly convert e.g. compound-word boundaries). I get this is the new fancy thing to do, but I would like to disable it, either by setting an environment variable, a fontconfig fonts.conf(5) setting or similar, or by patching the application. (Modifying the font is no option for most due to licencing issues.)
I cannot find any documentation for this, though. Other people are writing text editors and have similar problems due to the rise of “coding ligatures” in fonts, but so far nobody has provided a workable solution to disable them.
