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


From: Clément Pit--Claudel
Subject: bug#27103: Should show-trailing-whitespace highlight specified spaces?
Date: Sun, 28 May 2017 12:43:23 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1

On 2017-05-28 12:28, Eli Zaretskii wrote:
>> Cc: 27103@debbugs.gnu.org
>> From: Clément Pit--Claudel <clement.pitclaudel@live.com>
>> Date: Sat, 27 May 2017 15:52:27 -0400
>>
>> Would the same caveat apply to the creation of a new 'left-fringe text 
>> property, such that instead of (concat "A" (propertize "_" 'display 
>> '(left-fringe filled-square))) one could write (propertize "A" 'left-fringe 
>> 'filled-square)?
> 
> I'm not sure I understand why the former uses 'concat', while the
> latter doesn't.  So perhaps I'm missing the point, because otherwise
> this looks like just "syntactic sugar", is it?

It uses `concat' because the display spec is replacing.  Let me try a better 
example :) Consider a buffer with contents like this:

  (defun …
    …)

  (defun …
    …)

Suppose I want to highlight each defun with a fringe indicator.  With my 
proposal, one could use the following font-lock rule:

  ("^(defun" (0 '(face nil left-fringe right-arrow)))

And the contents of the buffer would look like this:

→ (defun …
    …)

→ (defun …
    …)

I don't think such a result is currently achievable without overlays (which are 
not nearly fast enough for my purposes).

Cheers,
Clément.

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