Le dim. 19 janv. 2020 à 16:22, Eli Zaretskii <
eliz@gnu.org> a écrit :
> From: Fabrice Popineau <fabrice.popineau@gmail.com>
> Date: Sun, 19 Jan 2020 10:17:01 +0100
>
> With the current master (and for a couple of months), I observe this redisplay problem where moving the
> cursor up or down, when the buffer is scrolled, the cursor may leave some ghost trace. This is with
> w32-use-visible-system-caret set to t. It seems the problem does not happen if this variable is set to nil.
Please show a reproduction recipe starting from "emacs -Q". Your
image seems to show a trace on every line, which is not what I see
here. What I see here is 2 artefacts: one in the middle of the
window, another at its beginning, and this problem seems to have
started with Emacs 25.1, not a few months ago.
From what I tried, it is not completely deterministic (or it depends on many parameters).
Best bet to reproduce the problem: visit some long org file like
or-manual.org from the org distribution,
with 'emacs -Q',
use C-S-tab 3 times to expand all headings
and run sequences of C-n and C-p to force scrolling of the buffer.
You should see those artefacts at some point.
Fabrice