bug#44236: [PATCH] xdisp: Apply nobreak-char-display also to NARROW NO-BREAK SPACE U+202F

[Drew Adams <drew.adams@oracle.com>]

> But what is the purpose of showing this character like we do with
> NBSP?  We do that with NBSP because otherwise it will be easy to
> interpret NBSP as a SPC: they have the same width and appearance on
> display.  By contrast, U+202F NARROW NO-BREAK SPACE is much thinner,
> and cannot be mistaken to be SPC.
> 
> OTOH, if we make U+202F stand out, then why not others, for example
> U+2007? or U+2060? or U+2002? or U+2003? or U+2009 etc.
> 
> IOW, we need to decide on the rationale for displaying these
> specially, and then we can decide which ones should have this applied.

I agree, both (1) that the main purpose of the current highlighting is to make no-break (aka hard) space stand out from ordinary space, and (2) that any additional highlighting needs a rationale.
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FWIW -

My library highlight-chars.el lets you highlight particular chars in different ways, au choix.  And in particular, you can highlight just hard spaces or just hard hyphens (they need not be treated the same way).

https://www.emacswiki.org/emacs/download/highlight-chars.el