[Bug localedata/31370] wcwidth() does not treat DEFAULT_IGNORABLE_CODE_POINTs as zero-width

[julesbertholet at quoi dot xyz]

https://sourceware.org/bugzilla/show_bug.cgi?id=31370

--- Comment #6 from Jules Bertholet <julesbertholet at quoi dot xyz> ---
(Apologies for the previous mangled message, I accidentally submitted while
editing) 

…The displayed width of many characters depends on the context, surrounding
characters, the particular font, etc. `wcwidth()` can only ever be "best
effort." See <https://www.unicode.org/L2/L2023/23107-terminal-suppt.pdf> for
some more background.

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