[Issue 18205] Format string with width specification doesn't work with multibyte characters

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18205

--- Comment #4 from hsteoh at quickfur.ath.cx ---
This is a long-standing issue that has been known for a while now. It's not so
easy to fix because the correct behaviour depends on byGrapheme, but the last
time I checked, that breaks @safety and CTFE-ability.

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