On: How to chop off bytes of an UTF-8 string to fit in...

[amelius]

Why is that a problem? If you cut off the country, at least you know that there was a flag. If you cut off the entire grapheme, then you know nothing!

[bux93 → amelius]

Well, if the user entered a French flag, and then you show it back to them as a white flag, you may cause a bit of an international incident. Or worse, accusations of telling very old jokes.

[recursive → amelius]

I think you'd just get the first letter of the country code and not a flag at all.