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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 21:26:14 +0300 |
tags 27103 notabug
thanks
> From: Clément Pit--Claudel <clement.pitclaudel@live.com>
> Date: Sat, 27 May 2017 12:47:40 -0400
>
> 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
> left-arrow)])
>
> 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?
I think you are hitting on undefined behavior: mixing different
replacing specs in the same display property is not generally
supported.
> Is there a way to disable the trailing whitespace highlighting here?
You could swap the order of 'space' and 'left-fringe' specs, but the
fact that this works is sheer luck, and I wouldn't recommend relying
on that.
The rule is to use at most one replacing spec in a display property.
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Clément Pit--Claudel, 2017/05/27
- bug#27103: Should show-trailing-whitespace highlight specified spaces?,
Eli Zaretskii <=
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Clément Pit--Claudel, 2017/05/27
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Eli Zaretskii, 2017/05/27
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Clément Pit--Claudel, 2017/05/27
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Eli Zaretskii, 2017/05/28
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Clément Pit--Claudel, 2017/05/28
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Eli Zaretskii, 2017/05/28
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Clément Pit--Claudel, 2017/05/28
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Eli Zaretskii, 2017/05/28
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Clément Pit--Claudel, 2017/05/28
- bug#27103: Should show-trailing-whitespace highlight specified spaces?, Eli Zaretskii, 2017/05/28