GNU bug report logs - #18793
24.4; zero width rectangular selection displaces text

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Message #40 received at 18793 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: carlosjosepita <at> gmail.com, monnier <at> iro.umontreal.ca, 18793 <at> debbugs.gnu.org
Subject: Re: bug#18793: 24.4; zero width rectangular selection displaces text
Date: Fri, 06 May 2022 14:19:55 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: monnier <at> iro.umontreal.ca,  carlosjosepita <at> gmail.com,  18793 <at> debbugs.gnu.org
> Date: Fri, 06 May 2022 13:05:45 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > I'm not sure: how would such a vertical line indicate that it's
> > region?
> 
> The same way the current one-pixel-wide thing does?  I.e., not very
> well.

The current one-pixel thing is displayed outside of the character
cell, and it has the color of the region face.

> > And how will it be visible, given that the cursor is displayed on that
> > same character?  Or maybe I don't understand what you mean by "a
> > vertical line through a character"?
> 
> The cursor usually blinks, so the line will be somewhat visible.

Usually, but not always.  More generally, I'm not sure the visual
effect will be satisfactory, when it blinks.

> But I was thinking that perhaps the box cursor would also react to that
> line in some way, for instance by using a reverse colour where the
> vertical line is.

That'd mean we need to display the cursor specially there.  IOW, it is
no longer a simple face.

It might be better and easier to introduce a defcustom that disables
the visualization of zero-width rectangles.  Was that considered as a
solution to this issue?

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