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bug#55159: 29.0.50; ruler mode collides with header-line-format
From: |
Eli Zaretskii |
Subject: |
bug#55159: 29.0.50; ruler mode collides with header-line-format |
Date: |
Thu, 28 Apr 2022 08:57:28 +0300 |
> From: Jean Louis <bugs@gnu.support>
> Date: Thu, 28 Apr 2022 07:56:48 +0300
>
>
> Following does not work as expected:
>
> (progn
> (ruler-mode)
> (setq header-line-format "Instructions"))
>
> And it should -- I am not sure, but I guess that it worked before,
> because I have a function that always uses ruler-mode and title.
In what version of Emacs was that?
> The header-line should be displayed above the ruler in my opinion. Both
> combinations should work regardless if header-line-format comes first or
> second.
ruler-mode.el uses the header-line to display the ruler. It always
did. So by overwriting header-line-format in a buffer under
ruler-mode you shoot yourself in the foot; don't do that.
I very much doubt that it ever worked for you as you describe, because
ruler-mode.el used header-line since it was first introduced in Emacs
22.1. From NEWS.22:
** The ruler-mode.el library provides a minor mode for displaying an
"active" ruler in the header line. You can use the mouse to visually
change the `fill-column', `window-margins' and `tab-stop-list'
settings.
So I see no bug here, but a cockpit error.