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

["julesbertholet at quoi dot xyz" <sourceware-bugzilla@sourceware.org>]

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

--- Comment #5 from Jules Bertholet <julesbertholet at quoi dot xyz> ---
> What do the libicu APIs return for these characters?

They don't. Unicode does not in general have a concept of how many "cells" a
character should take up in a terminal or with a fixed-width font. Some
characters are specified to be 0-width/non-advancing, and there is also a
limited concept of "East Asian Wide" defined by UTR 11
<https://www.unicode.org/reports/tr11/>. But the displayed width of many
characters depends on the context, surrounding characters, the particular font,
etc. `wcwidth()See <https://www.unicode.org/L2/L2023/23107-terminal-suppt.pdf>
for some more background.

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