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Re: [O] Emacs master, faces with :extend t let cursor vanish at EOL?!

From: Kaushal Modi
Subject: Re: [O] Emacs master, faces with :extend t let cursor vanish at EOL?!
Date: Tue, 22 Oct 2019 16:17:04 -0400

On Tue, Oct 22, 2019 at 3:52 PM Ingo Lohmar <address@hidden> wrote:
I am writing to the org-mode list first, because I have only been able
to reproduce this problem in org-mode.

With a recent Emacs master build, faces can have the :extend t property
to indicated that they should extend after the newline.  This is useful
for a user to customize, eg, for `org-block', and it also applies to
default faces like `region', `highlight' or `secondary-selection'.


I have been seeing this issue too, but I haven't found time to create a proper bug report for it.

But now that you have this email, I am forwarding this to the Emacs devel list too.

The issue occurs because of the new :extend feature for faces to extend till end of lines.

With that enabled, I have also seen that the cursor "hides" automatically only at end of lines inside the Org source blocks. i.e within

#+begin_src emacs-lisp
(message "hello")X

Above: X is where the cursor would be, but it would not be visible (with the :extend t added to the org-block face). The cursor would show up again on doing C-b i.e. bringing it to any column position other than the EOL.
Using this with a current elpa pkg of org-mode, and setting :extend t on
faces like `org-block`, "often" the cursor vanishes at the EOL of a line
using such a face.  It reliably happens for `org-block', only sometimes
for `secondary-selection'.

Has anybody else experienced that as well, or do you have any pointers
on how to further investigate this?  I think I remember that org-mode does
something with text overlays, but I can't relate that to what I see.

There might also be an issue with face inheritance and the new :extend
attribute --- I might post on emacs-devel to get a better idea of that
as well.


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