Segmentation fault in `cairo_scaled_font_status` on Linux when loading 'DejaVu Sans' font about vstgui HOT 2 CLOSED

Original problem has 2 different sources:

1. on localized (not "en_us") Linux, fontconfig library returns strings in current locale, in case they are available in the font (MS Arial has translations for styles). Since cairofont.cpp has styles hardcoded in English (f.e. "Regular"), they do not match. Triggering the second problem...

To check that is the case: "fc-match Arial" does not print "Regular", but its translation.

2. as already written before, in case required style can not be found there is no check. That produce mentioned crash.

Possible solution for (1) is one line patch for lib/platform/linux/cairofont.cpp :

auto pattern = FcPatternCreate ();
(new line) FcPatternAddString (pattern, FC_NAMELANG, (FcChar8 *)"en-us");
auto objectSet = FcObjectSetBuild (FC_FAMILY, FC_FILE, FC_STYLE, nullptr);

Alternatively, crashing program can be started with LANG=en (or at least FC_LANG=en)

from vstgui.

Should now at least be fixed on the develop branch.

from vstgui.