[Fontconfig] how to modify the `variable` property?

[Werner LEMBERG]

>> Great!  It is probably sufficient to mention that `<acceptfont>`
>> and `<rejectfont>` are only influenced by `<match target="scan">`
>> and not by the targets 'font' and 'pattern'.
> 
> Sure. Please file an issue to keep it track.

https://gitlab.freedesktop.org/fontconfig/fontconfig/-/issues/363

>> By the way, why is that so?  It looks like an artificial
>> limitation, and as my real-world example shows it can cause
>> problems.
> 
> No idea.  I sometimes see someone want to filter out per font files
> by glob though, this may be a first time to see for a certain
> pattern only.  so it may be just a corner case and didn't get enough
> feedback on pattern-based?  dunno.

It would be great if this limitation could be lifted...


    Werner