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[debbugs-tracker] bug#27103: closed (Should show-trailing-whitespace hig

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#27103: closed (Should show-trailing-whitespace highlight specified spaces?)
Date: Mon, 29 May 2017 02:31:01 +0000

Your message dated Mon, 29 May 2017 05:30:38 +0300
with message-id <address@hidden>
and subject line Re: bug#27103: Should show-trailing-whitespace highlight 
specified spaces?
has caused the debbugs.gnu.org bug report #27103,
regarding Should show-trailing-whitespace highlight specified spaces?
to be marked as done.

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27103: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=27103
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--- Begin Message --- Subject: Should show-trailing-whitespace highlight specified spaces? Date: Sat, 27 May 2017 12:47:40 -0400 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1
Hi emacs-devel,

I'm trying to display "/// " comment markers as a thin vertical line. At first, 
I went for something like the following font-lock rule:

  '(face my-vertical-line-face display (space :width 0.5))

This worked fine, until I decided to add a fringe icon, too:

  '(face my-vertical-line-face display [(space :width 0.5) (left-margin 

Now (with show-trailing-whitespace set to t) Emacs highlight lines that just 
contain "///" in bright red.  Here's a quick way to reproduce this:

  (dotimes (_ 25) (insert (propertize "///" 'display '((space :width 10) 
(left-fringe left-arrow))) "\n"))

Contrast with this, which doesn't show trailing-whitespace highlights:

  (dotimes (_ 25) (insert (propertize "///" 'display '(space :width 10)) "\n"))

Am I doing something wrong?  Or is this a bug, and if so which behavior is the 
correct one? Is there a way to disable the trailing whitespace highlighting 

The best I've managed is to put the left-fringe property on the first "/" 
character, and the display property on the next two, but this interacts in 
annoying ways with point motion.  I added cursor-intangible properties to the 
mix too, but no luck (they interacted badly with insertion/deletion)


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--- Begin Message --- Subject: Re: bug#27103: Should show-trailing-whitespace highlight specified spaces? Date: Mon, 29 May 2017 05:30:38 +0300
> Cc: address@hidden
> From: Clément Pit--Claudel <address@hidden>
> Date: Sun, 28 May 2017 16:18:02 -0400
> >>   (insert (propertize "AA" 'line-prefix (propertize "_" 'display 
> >> '(left-fringe right-arrow))))
> > 
> > That's not what I meant, but if you are happy, it's fine with me.
> I didn't realize that this was possible. It fits my use case very nicely :) 
> In the (defun example, I can just put the line-prefix property on the defun, 
> and everything works perfectly.
> I wonder if we should mention this in the manual. Maybe in the "display 
> specs" section, where (fringe …) is described, we could add this:
>   `left-fringe' and `right-fringe' are replacing specs: the span of text that 
> they apply to is made invisible.  To add a fringe to a line without hiding 
> any of its contents, put the fringe property on the before-string of an 
> overlay or on the line-prefix of your text.

That's the kind of "howto" stuff that doesn't really belong to a

> >> Anything bad with this?
> > 
> > It's just a display property.  Nothing wrong with that, of course.
> Thanks!

OK, closing.

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