GNU bug report logs - #34710
the mode line flicks on set-window-vscroll

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Package: emacs;

Reported by: Tak Kunihiro <tkk <at> misasa.okayama-u.ac.jp>

Date: Sat, 2 Mar 2019 10:33:02 UTC

Severity: minor

Tags: fixed

Merged with 31904, 32932, 33891, 34127, 36302

Found in versions 26.1.90, 26.1.91, 26.2.90, 27.0.50

Fixed in version 28.1

Done: Alan Third <alan <at> idiocy.org>

Bug is archived. No further changes may be made.

Full log

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Tak Kunihiro <tkk <at> misasa.okayama-u.ac.jp>
To: bug-gnu-emacs <at> gnu.org
Cc: 国広卓也 <tkk <at> misasa.okayama-u.ac.jp>
Subject: the mode line flicks on set-window-vscroll
Date: Sat, 2 Mar 2019 19:25:13 +0900

On Emacs-26.1.92 build for macOS, I see the mode line flicks when I
scroll-up using pixel-scroll-mode and mouse wheel.  The mode line does
not flick on scrolling-down.  I do not see this problem in
Emacs-26.1.92 build for Windows.

macOS$ /Downloads/emacs-26.1.92/nextstep/Emacs.app/Contents/MacOS/Emacs -Q
M-x pixel-scroll-mode
M-: (pixel-scroll-up 1) ; => the mode line flicks
M-: (pixel-scroll-down 1) ;=> no flick

I narrow down the problem and notice that following
two blocks response differently.

#+begin_src emacs-lisp
(dolist (vs (number-sequence 1 10))
  (set-window-vscroll nil vs t)
  (sit-for 0))
;; the mode line flicks
#+end_src

#+begin_src emacs-lisp
(dolist (vs (number-sequence 1 10))
  (set-window-vscroll nil vs t))
;; no flick
#+end_src

Do you have idea?
This bug report was last modified 5 years and 93 days ago.

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