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

From: Eric S Fraga
Subject: Re: Emacs master, faces with :extend t let cursor vanish at EOL?!
Date: Thu, 31 Oct 2019 16:55:47 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

On Wednesday, 23 Oct 2019 at 19:06, Eli Zaretskii wrote:
>> From: Kaushal Modi <address@hidden>
>> The issue occurs because of the new :extend feature for faces to extend till 
>> end of lines.


> I tried to reproduce this, but couldn't.  The OP says "often", so I
> understand the problem is not 100% reproducible and the exact
> situations in which it arises are not yet known.
> So I suggest to find a reproducible recipe and then report it with
> report-emacs-bug, so that the problem could be debugged and solved.

(emacs up to date from git a few minutes ago)

I see this, in a reproducible way, when using hl-line-mode in
combination with visual-line-mode and evil-mode.  In Evil's "normal"
mode, my cursor is a block.  This block disappears when at EOL if the
hl-line face is extended to include the EOL position (by modifying
hl-line-range-function).  I have the following:

#+begin_src emacs-lisp
  (defun esf/get-visual-line-range ()
    (let (b e r)
        (setq b (point))
        (setq e (point))
        ;; (setq e (+ 1 (point)))
        ;; (beginning-of-line)
        ;; (setq r (point))                  ;real beginning of line
        ;; (if (< r b) (setq b (+ b 1)))     ;adjust to avoid extension 
      (cons b e)))
  (setq hl-line-range-function #'esf/get-visual-line-range)

If I uncomment the first commented line, and comment out the one above,
I get the hl-line face extended very nicely to the edge of the window
*but* my cursor disappears if it is past the last text character on the
line.  If I keep the code as it is, the hl-line face only covers the
text, it is not extended, and the cursor is visible.

Aside: the other bits commented out are to deal with the face sometimes
extending backwards onto the previous line; another edge effect...


Eric S Fraga via Emacs 27.0.50 & org 9.2.6 on Debian bullseye/sid

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