Extra characters printed when formatting invalid UTF-8 with precision

[lriesterer]

Formatting using string precision fails when there are non-ascii characters.

Here is a code to reproduce (first line works as expected, second doesn't as there is an extra "diamond-shaped" character printed):

#include <fmt/format.h>
int main()
{
    fmt::print(">>{:.6}<<\n", "1234567");
    fmt::print(">>{:.6}<<\n", "123456\xad");
    return 0;
}

https://godbolt.org/z/zzY4Y4Pec

[vitaut]

Fixed in c13753a. Thanks for reporting!