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Starting from questions in this thread I’d like to continue this issue seperately.
1“In these days, I think one can reasonably expect Latin fonts of a certain kind supporting all Latin-related languages. Why shouldn’t it?”
2“Can you clarify what you mean by 'of a certain kind'?”
I mean fonts which obviously come and appear as being text fonts, typefaces for setting body text.
… where exactly (…) to get information about the necessary glyph repetoire?
*That* is the point. I think: nowhere. For myself, I know nothing of relying on my own research. I started whith default codepages. Then I took the impressive UDHR-in-Unicode text samples for testing the coverage of my fonts. Not an absolutely safe tester, but quite a useful one.
… especially those with emerging orthographies would be IMHO very difficult.
Yes of course they are. You can’t set up a fixed schedule for an orthography still evolving. But such cases hardly matter here, i.m.h.o.
… but with ~4000 languages spoken on earth, no designer is going to be able
Slowly, slowly. We talked about the field of Latin-written languages. After all, that field is quite comfortably mapped, with few risk of omitting essentials.
… a perfectly reasonable position to take, but it still excludes a great many latin-based languages. My point is simply that designers must make some sort of decision of this type, and that decision will inevitably exclude some language which someone else might think should be part of that minimum target.
Well, it’s up to you to exclude or to include. It is not so difficult to set up a scheme that comprises, let’s say, all Germanic, Romanic, Celtic, Slavonic, Baltic, Finno-Ugric, Turk languages alongside with some others to complete the (European) map of Latin writing. And it’s not so tricky to decide upon wether to include or exclude the Vietnamese and/or African/Latin-B blocks … Maybe information about (native) American orthographies are more rare, but it should be possible to assemble this as well.
However, what I think you are thinking about, is actually a question for a kind of standard. A kind which neither UC tables nor default codepages represent. So it’s up to ourselves – a great chance (i.m.h.o.).