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

["Clément Pit--Claudel" <clement.pitclaudel@live.com>]

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On 2017-05-28 15:51, Eli Zaretskii wrote:
>> Cc: 27103@debbugs.gnu.org
>> From: Clément Pit--Claudel <clement.pitclaudel@live.com>
>> Date: Sun, 28 May 2017 15:43:52 -0400
>>
>>> Maybe we could extend the line-prefix property to support left-fringe
>>> and right-fringe specs.
>>
>> Hey, it works!
>>
>>   (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.

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

Thanks!



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