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Re: non-breaking hyphens

From: Chong Yidong
Subject: Re: non-breaking hyphens
Date: Tue, 18 Oct 2011 08:08:00 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.90 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> I'm not sure I understand the goal of `nobreak-char-display'.  Is it for
>> warning the user when there is an ASCII look-alike character that isn't
>> really ASCII?  I guess that's mainly to avoid issues with source code?
> Yes, probably.  But I'm only guessing here.  Can you find any traces
> of discussing this in the archives?

This is what I found, though it does not explain the rationale for the


And here was a request to consider adding U+FEFF to the list of
characters handled by nobreak-char-display, which apparently petered


The right way to implement this feature, as brought up in the 2004
thread, would be to specify the affected characters with a char-table
rather than hardcoding them.  But we should probably leave such a change
till after 24.1.

In the meantime, I think I'll add non-breaking hyphen and hyphen to the
hardcoded list, while deferring on the various other space characters;
many of those spaces are defined to have specific widths, so it's not
clear that changing their appearance to a highlighted space is the right
thing for Emacs to do.

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