GNU bug report logs - #70485
30.0.50; Asymetrical margins break mode-line-right-align-edge

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From: Charles Gonnaud <charles.gonnaud <at> gmail.com>
To: 70485 <at> debbugs.gnu.org
Subject: bug#70485: 30.0.50; Asymetrical margins break mode-line-right-align-edge
Date: Sat, 20 Apr 2024 23:38:18 +0200

Hello to all,
Thank you for your work maintaining emacs, this is my first bug report
so please be indulgent.

*** Bug description

I use a minor-mode similar to olivetti
(https://github.com/rnkn/olivetti), which uses margins to center the
text in the window.

Playing around with the doom modeline, which copied emacs 30's
implementation of `mode-line-right-align-edge', I noticed that setting
a different margin on the left and right resulted in a cropped modeline
to the right.

*** Suggested patch

In mode--line-format-right-align() (lisp/bindings.el:384)
- (* (or (cdr (window-margins)) 1)
+ (* (or (car (window-margins)) 0)

*** Minimal init.el to reproduce

;; Use a custom mode-line with text aligned to the right
;;|foo bar|
(setq-default mode-line-format
(list "foo" 'mode-line-format-right-align "bar" ))

;; Helper commands to set a margin left, right, or reset to nil.
;; Cycle between those and see the mayhem happen on the modeline.
;; Reset margins
(keymap-global-set "<f1>"
(lambda()
(interactive)
(set-window-margins (selected-window) nil)))

;; Set margin to the left only
(keymap-global-set "<f2>"
(lambda()
(interactive)
(set-window-margins (selected-window) 10 0)))

;; Set margin to the right only
(keymap-global-set "<f3>"
(lambda()
(interactive)
(set-window-margins (selected-window) 0 10)))

Thank you for your time,
Cheers,
Charles


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.41, cairo version 1.18.0) of 2024-04-20 built on archcharles
Repository revision: 21e33567fabdc1310005ff6f96684be514527e8d
Repository branch: master
System Description: Arch Linux

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY PDUMPER
PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
value of $LANG: en_GB.UTF-8
locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
recentf-mode: t
outline-minor-faces-mode: t
outline-minor-mode: t
electric-pair-mode: t
rainbow-delimiters-mode: t
ijkl-mode: t
ijkl-local-mode: t
corfu-terminal-mode: t
global-corfu-mode: t
corfu-mode: t
my/clang-format-auto-mode: t
yas-global-mode: t
yas-minor-mode: t
marginalia-mode: t
vertico-mode: t
key-chord-mode: t
which-key-mode: t
delete-selection-mode: t
global-auto-revert-mode: t
savehist-mode: t
display-time-mode: t
display-battery-mode: t
my/keys-mode: t
override-global-mode: t
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
minibuffer-regexp-mode: t
size-indication-mode: t
column-number-mode: t
line-number-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
hs-minor-mode: t

Load-path shadows:
/home/charles/.config/emacs/elpa/transient-20240415.1548/transient hides 
/usr/local/share/emacs/30.0.50/lisp/transient

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Memory information:
((conses 16 551922 121165) (symbols 48 29879 12)
(strings 32 175254 6561) (string-bytes 1 4198058) (vectors 16 50184)
(vector-slots 8 1132229 191276) (floats 8 356 762)
(intervals 56 12770 574) (buffers 992 29))

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