GNU bug report logs - #32676
[PATCH] Add option to highlight the 'next-error' error message

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Ernesto Alfonso <erjoalgo <at> gmail.com>
Cc: rpluim <at> gmail.com, 32676 <at> debbugs.gnu.org
Subject: bug#32676: Feature request
Date: Thu, 13 Sep 2018 19:44:04 +0300

> From: Ernesto Alfonso <erjoalgo <at> gmail.com>
> Date: Thu, 13 Sep 2018 08:02:48 -0700
> Cc: Eli Zaretskii <eliz <at> gnu.org>, 32676 <at> debbugs.gnu.org
> 
> The problem is that there are two independent* markers, point, and a marker at the beginning of the current
> error line in the next error buffer, for example compilation-current-error, where the fringe arrow is displayed.
> 
> In the same way that the user can move around the point in the next-error buffer between calls to
> {next,previous}-error without affecting the location of the fringe arrow, the user should also be able to move
> point around without affecting highlighting of the current error message (for example, to kill part of an error
> message in the compilation buffer), since this is really a visual enhancement to the fringe arrow.  

You should be able to fix this problem by setting
hl-line-range-function to a suitable function (which should be quite
simple, AFAIU).

> Another problem with hl-line is what the original poster pointed out in the screenshot below: hl-line only
> highlights on the current buffer's window, so if the user were to switch to the source code buffer (or if he
> wasn't there in the first place, e.g. by having invokied next-error form the source code buffer via a key
> binding) then highlighting of error messages is either lost or never happens.

This is only true for the global-hl-line-mode; the local mode's
highlight is "sticky" by default, and shows even in non-selected
windows.

Moreover, you can customize the global mode so that its highlight is
sticky as well (not that I see why would you want to in this case).

> Basically, the difference is that hl-line uses post-command-hooks to track the current line and put an overlay
> on it, whereas in this case highlighting only changes whenever next-error-hook is invoked.

Is this really important?  Those are just implementation details, no?

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