bug#74866: 29.4; fit-frame-to-window + no vertical scroll bar + changed face height = mess

bug#74866: 29.4; fit-frame-to-window + no vertical scroll bar + changed face height = mess

[toomas]

----------------8<----------------8<----------------8<----------------

In "emacs -Q" under X (I have XFCE), evaluate:

(defun fit (lin col)
  "Fit some text (LIN lines and COL columns) into a newly created frame."
  (interactive)
  (let ((buf (get-buffer-create "*foo*"))
        (frm (make-frame '((z-group . above)))))
    (with-current-buffer buf
      (erase-buffer)
      (setq mode-line-format '(""))
      (dotimes (_ lin) (insert (format "%s\n" (make-string col ?x))))
      (goto-char (point-min)))
    (with-selected-frame frm
      (switch-to-buffer buf)
      (fit-frame-to-buffer))))
;;; LIN and COL are arbitrary, make them sufficiently small.
(fit 9 23)

So far, so good.  Now evaluate the following:

(setq-default vertical-scroll-bar nil)
(set-face-attribute 'default nil :height 75)
(fit 9 23)

On my system, the frame's width is now one character short and the lines
do not fit in the new frame any more.

---------------->8---------------->8---------------->8----------------

In GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
 cairo version 1.18.2) of 2024-12-10 built on localhost
Windowing system distributor 'The X.Org Foundation', version 11.0.12101014
System Description: Gentoo Linux

Configured using:
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Important settings:
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bug#74866: 29.4; fit-frame-to-window + no vertical scroll bar + changed face height = mess

[Eli Zaretskii]

> From: toomas@rosin.ee
> Date: Sat, 14 Dec 2024 14:57:31 +0200
> 
> 
> ----------------8<----------------8<----------------8<----------------
> 
> In "emacs -Q" under X (I have XFCE), evaluate:
> 
> (defun fit (lin col)
>   "Fit some text (LIN lines and COL columns) into a newly created frame."
>   (interactive)
>   (let ((buf (get-buffer-create "*foo*"))
>         (frm (make-frame '((z-group . above)))))
>     (with-current-buffer buf
>       (erase-buffer)
>       (setq mode-line-format '(""))
>       (dotimes (_ lin) (insert (format "%s\n" (make-string col ?x))))
>       (goto-char (point-min)))
>     (with-selected-frame frm
>       (switch-to-buffer buf)
>       (fit-frame-to-buffer))))
> ;;; LIN and COL are arbitrary, make them sufficiently small.
> (fit 9 23)
> 
> So far, so good.  Now evaluate the following:
> 
> (setq-default vertical-scroll-bar nil)
> (set-face-attribute 'default nil :height 75)
> (fit 9 23)
> 
> On my system, the frame's width is now one character short and the lines
> do not fit in the new frame any more.
> 
> ---------------->8---------------->8---------------->8----------------
> 
> In GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
>  cairo version 1.18.2) of 2024-12-10 built on localhost
> Windowing system distributor 'The X.Org Foundation', version 11.0.12101014
> System Description: Gentoo Linux

FWIW, I cannot reproduce this, neither in Emacs 29.2 nor in the
current emacs-30 branch (which will soon become Emacs 30.1).

Martin, any comments?

bug#74866: 29.4; fit-frame-to-window + no vertical scroll bar + changed face height = mess

[martin rudalics via Bug reports for GNU Emacs, the Swiss army knife of text editors]

 > Martin, any comments?

Looks like an idiosyncrasy of 'set-face-attribute'.  The following seems
to work here.  Don't ask me why.

(defun fit (lin col)
   "Fit some text (LIN lines and COL columns) into a newly created frame."
   (interactive)
   (let ((buf (get-buffer-create "*foo*"))
         (frm (make-frame '((z-group . above) (vertical-scroll-bars . nil)))))
     (with-current-buffer buf
       (erase-buffer)
       (setq mode-line-format '(""))
       (dotimes (_ lin) (insert (format "%s\n" (make-string col ?x))))
       (goto-char (point-min)))
     (with-selected-frame frm
       (switch-to-buffer buf)
       (set-face-attribute 'default nil :height 57)
       (fit-frame-to-buffer))))

martin

bug#74866: 29.4; fit-frame-to-window + no vertical scroll bar + ch

[Toomas Rosin]

Thank you, this got the damn thing working for me.  As the lines about
vertical scroll bars and font size were from my init.el, I was loath to
clutter my function with them and hoped to get away with only adding the
`vertical-scroll-bars' item to the `frame-attributes' arg of
`make-frame'.  And indeed, this worked.  So the final form of my MWM
looks like this:

;;; init.el:
(setq-default vertical-scroll-bar nil)
(set-face-attribute 'default nil :height 75)

;;; main code:
(defun fit (lin col)
  "Fit some text (LIN lines and COL columns) into a newly created frame."
  (interactive)
  (let ((buf (get-buffer-create "*foo*"))
        (frm (make-frame
         `((z-group . above)
           (vertical-scroll-bars . ,vertical-scroll-bar)))))
    (with-current-buffer buf
      (erase-buffer)
      (setq mode-line-format '(""))
      (dotimes (_ lin) (insert (format "%s\n" (make-string col ?x))))
      (goto-char (point-min)))
    (with-selected-frame frm
      (switch-to-buffer buf)
      (fit-frame-to-buffer))))

Cheers, T.