When:
- 2 windows open the same file
- There's a timer dealing with modeline or header-line format
Then pressing `C-g` sometimes scrolls the buffer in this window to the
position in the other window.
Here's a recipe for reproduce:
- `$ emacs -Q`
- Eval this:
```
(run-with-timer 0 0.1 (lambda () (setq mode-line-format "hi")))
```
- `M-x delete-other-windows` so we have only one window.
- `C-x C-f` to open a file. I use
<
https://github.com/lsof-org/lsof/blob/master/main.c> when testing,
but any file that's long enough should work.
- `M-x split-window-horizontally`, so we have 2 windows viewing the same
file. For some reason, splitting vertically doesn't trigger the
problem.
- Scroll one window down to somethere.
- Hold `C-g` or press it repeatedly and quickly, then the window will go
to the same position in file as the other window.
You can do the same with `header-line-format`, it also has the problem.
Using `run-with-idle-timer` instead seems doesn't have the problem.
See also <
https://github.com/kiennq/emacs-mini-modeline/issues/45> where
I report the same problem. I believe another package that's influenced
by this is <
https://github.com/purcell/mode-line-bell>.
--- Info generated by `report-emacs-bug` ---
In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, cairo version 1.17.3)
of 2020-08-29 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12009000
System Description: Manjaro Linux
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark set
[nil 24482 55348 93490 0.1 (closure (t) nil (setq mode-line-format "hi")) nil nil 920000]
You can run the command ‘split-window-horizontally’ with M-x sp-h RET
Quit [22 times]
Quit
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