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bug#27103: Should show-trailing-whitespace highlight specified spaces?


From: Eli Zaretskii
Subject: bug#27103: Should show-trailing-whitespace highlight specified spaces?
Date: Sat, 27 May 2017 22:42:45 +0300

> Cc: 27103@debbugs.gnu.org
> From: Clément Pit--Claudel <clement.pitclaudel@live.com>
> Date: Sat, 27 May 2017 15:14:00 -0400
> 
> Would it be a reasonable feature request to ask for a non-replacing version 
> of left-fringe and right-fringe?

I'm not sure.  Non-replacing specs are those which affect the way the
text having the display property is displayed, but you want something
else: a portion of text that is both displayed normally and produces
the fringe bitmap.  That's not how display properties work.

IOW, it looks like implementing something like that will need serious
changes in how the display engine works, because it basically
traverses across a given buffer position only once.





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