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:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --datarootdir=/usr/share
 --disable-silent-rules --docdir=/usr/share/doc/emacs-29.4
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 --program-suffix=-emacs-29 --includedir=/usr/include/emacs-29
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 -ffp-contract=off' CPPFLAGS= 'LDFLAGS=-Wl,-O1 -Wl,--as-needed
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Configured features:
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INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF X11 XDBE XIM XINPUT2
XPM GTK3 ZLIB

Important settings:
  value of $LANG: C.UTF8
  locale-coding-system: utf-8-unix

Major mode: Helpful

Minor modes in effect:
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  magit-auto-revert-mode: t
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  column-number-mode: t
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Load-path shadows:
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/usr/share/emacs/site-lisp/seq/seq hides /usr/share/emacs/29.4/lisp/emacs-lisp/seq

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hashtable-print-readable backquote threads dbusbind inotify lcms2
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Memory information:
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 (symbols 48 50845 60)
 (strings 32 231167 12276)
 (string-bytes 1 6352031)
 (vectors 16 117969)
 (vector-slots 8 2666758 108652)
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 (buffers 976 61))

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