GNU bug report logs - #65018
29.1; :align-to on wrapped line regression

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From: Axel Forsman <axel@HIDDEN>
Subject: 29.1; :align-to on wrapped line regression
Date: Wed, 02 Aug 2023 08:01:49 +0000 (UTC)
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 Content preview:  I noticed that the interpretation of the hpos given to the
 :align-to space specification property changed in Emacs 29.1 compared to
 28.2, without it being documented anywhere. In version 28 is counts [...] 
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I noticed that the interpretation of the hpos given to the :align-to
space specification property changed in Emacs 29.1 compared to 28.2,
without it being documented anywhere. In version 28 is counts relative
to the visual start of the line, whereas in version 29 it starts at the
logical start of the line.

That is, the following MWE exhibits different visual behavior in Emacs
28 contra 29:

    (insert
     (concat
      "\n"
      (make-string (round (* 1.25 (window-text-width))) ?x)
      (propertize " " 'display `(space :align-to ,(round (window-text-width) 2)))
      "foo\n\n"))

(In 28 the text "foo" is centered by the space. In 29 the space has
zero-width.)

The previous behavior makes more sense in the context of section 41.16.3
Pixel Specification for Spaces in the Emacs manual, and it would be
quite the breaking change so I am hoping it was unintentional.


Kind regards
Axel Forsman


In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu)
Repository revision: emacs-29.1
Repository branch: master
System Description: NixOS 23.05 (Stoat)

Configured using:
 'configure
 --prefix=/nix/store/whazydpl0yj8i03aapsd2cyry70mng55-emacs-unstable-29.1-nox
 --disable-build-details --with-modules --with-gif=no --with-jpeg=no
 --with-png=no --with-tiff=no --with-x=no --with-xpm=no
 --with-native-compilation --with-tree-sitter'

Configured features:
DBUS GMP GNUTLS GPM JSON LIBSELINUX LIBSYSTEMD LIBXML2 MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER SECCOMP SOUND SQLITE3 THREADS
TREE_SITTER ZLIB

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

Major mode: Lisp Interaction

Minor modes in effect:
  global-git-commit-mode: t
  windmove-mode: t
  corfu-mode: t
  shell-dirtrack-mode: t
  server-mode: t
  undo-tree-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  hotfuzz-vertico-mode: t
  vertico-mode: t
  xclip-mode: t
  evil-mode: t
  evil-local-mode: t
  electric-pair-mode: t
  delete-selection-mode: t
  global-auto-revert-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/run/current-system/sw/share/emacs/site-lisp/site-start hides /nix/store/whazydpl0yj8i03aapsd2cyry70mng55-emacs-unstable-29.1-nox/share/emacs/site-lisp/site-start

Features:
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korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable backquote
threads dbusbind inotify multi-tty make-network-process native-compile
emacs)

Memory information:
((conses 16 468565 236158)
 (symbols 48 28773 4)
 (strings 32 94980 23719)
 (string-bytes 1 3896638)
 (vectors 16 58239)
 (vector-slots 8 993657 111674)
 (floats 8 352 931)
 (intervals 56 17610 6129)
 (buffers 984 43))