bug#54634: 29.0.50; Off-by-one highlighting

bug#54634: 29.0.50; Off-by-one highlighting

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

REPRODUCTION STEPS:

1. emacs -Q
2. type M-: (setq show-paren-style ‘expression) RET
3. type M-: (set show-paren-priority 0) RET
4. type (foo)
5. type C-a to move to the beginning of the line
6. type C-M-@ to highlight the expression "(foo)"

EXPECTED:

The entire expression "(foo)" has active region highlight drawn over it
(matching what gets copied on M-w).

ACTUAL:

"(" has the parenthesis highlight and "foo)" has the active region
highlight (NOT matching what gets copied on M-w).

Rudy


In GNU Emacs 29.0.50 (build 3, x86_64-apple-darwin21.2.0, NS appkit-2113.20 Version 12.1 (Build 21C52))
 of 2022-03-29 built on Workstation.local
Repository revision: 55932a65ed719d4277e0e781ca5e323b189d7f63
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.1

Configured using:
 'configure --with-json --with-native-compilation'

Configured features:
ACL DBUS GIF GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP XIM ZLIB

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

Major mode: Fundamental

Minor modes in effect:
  global-hl-todo-mode: t
  global-diff-hl-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  marginalia-mode: t
  vertico-mouse-mode: t
  vertico-mode: t
  corfu-global-mode: t
  global-subword-mode: t
  save-place-mode: t
  global-auto-revert-mode: t
  pulsar-global-mode: t
  delete-selection-mode: t
  global-goto-address-mode: t
  shell-dirtrack-mode: t
  savehist-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  buffer-read-only: 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

Load-path shadows:
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~/src/org-mode/lisp/oc hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/oc
~/src/org-mode/lisp/ob-css hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-css
~/src/org-mode/lisp/ob-lob hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-lob
~/src/org-mode/lisp/ol-irc hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-irc
~/src/org-mode/lisp/ob-forth hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-forth
~/src/org-mode/lisp/org-macs hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-macs
~/src/org-mode/lisp/ob hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob
~/src/org-mode/lisp/org-version hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-version
~/src/org-mode/lisp/ob-scheme hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-scheme
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~/src/org-mode/lisp/org-capture hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-capture
~/src/org-mode/lisp/ob-ref hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-ref
~/src/org-mode/lisp/ob-clojure hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-clojure
~/src/org-mode/lisp/org-mouse hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-mouse
~/src/org-mode/lisp/org-ctags hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-ctags
~/src/org-mode/lisp/org-entities hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-entities
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~/src/org-mode/lisp/ob-screen hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-screen
~/src/org-mode/lisp/ol-bibtex hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-bibtex
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~/src/org-mode/lisp/ob-octave hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-octave
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~/src/org-mode/lisp/ob-eval hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-eval
~/src/org-mode/lisp/org-habit hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-habit
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~/src/org-mode/lisp/ol-eshell hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-eshell
~/src/org-mode/lisp/ob-ditaa hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-ditaa
~/src/org-mode/lisp/org-pcomplete hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-pcomplete
~/src/org-mode/lisp/org-lint hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-lint
~/src/org-mode/lisp/ox-latex hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-latex
~/src/org-mode/lisp/ob-sass hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-sass
~/src/org-mode/lisp/ob-tangle hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-tangle
~/src/org-mode/lisp/ob-calc hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-calc
~/src/org-mode/lisp/ob-java hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-java
~/src/org-mode/lisp/ox-icalendar hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-icalendar
~/src/org-mode/lisp/ol-mhe hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-mhe
~/src/org-mode/lisp/org-attach-git hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-attach-git
~/src/org-mode/lisp/ox-md hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-md
~/src/org-mode/lisp/ox-beamer hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-beamer
~/src/org-mode/lisp/org-element hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-element
~/src/org-mode/lisp/oc-natbib hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/oc-natbib
~/src/org-mode/lisp/org-protocol hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-protocol
~/src/org-mode/lisp/ob-gnuplot hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-gnuplot
~/src/org-mode/lisp/org-tempo hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-tempo
~/src/org-mode/lisp/ob-latex hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-latex
~/src/org-mode/lisp/ol-w3m hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-w3m
~/src/org-mode/lisp/org-id hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-id
~/src/org-mode/lisp/ox-man hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-man
~/src/org-mode/lisp/ol-doi hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-doi
~/src/org-mode/lisp/org-feed hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-feed
~/src/org-mode/lisp/ob-julia hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-julia
~/src/org-mode/lisp/ob-lua hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-lua
~/src/org-mode/lisp/ob-table hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-table
~/src/org-mode/lisp/ob-ocaml hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-ocaml
~/src/org-mode/lisp/oc-csl hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/oc-csl
~/src/org-mode/lisp/ol-gnus hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-gnus
~/src/org-mode/lisp/org-indent hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-indent
~/src/org-mode/lisp/ob-lilypond hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-lilypond
~/src/org-mode/lisp/ob-matlab hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-matlab
~/src/org-mode/lisp/org-datetree hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-datetree
~/src/org-mode/lisp/ol-docview hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-docview
~/src/org-mode/lisp/ob-python hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-python
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~/src/org-mode/lisp/org-agenda hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-agenda
~/src/org-mode/lisp/ob-dot hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-dot
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~/src/org-mode/lisp/org-compat hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-compat
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~/src/org-mode/lisp/ox-odt hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-odt
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~/src/org-mode/lisp/ob-plantuml hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-plantuml
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~/src/org-mode/lisp/ox-ascii hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-ascii
~/src/org-mode/lisp/org-loaddefs hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-loaddefs
~/src/org-mode/lisp/ox-koma-letter hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-koma-letter
~/src/org-mode/lisp/ob-maxima hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-maxima
~/src/org-mode/lisp/org hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org
~/src/org-mode/lisp/ol-bbdb hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ol-bbdb
~/src/org-mode/lisp/org-macro hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-macro
~/src/org-mode/lisp/ob-sql hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-sql
~/src/org-mode/lisp/org-attach hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/org-attach
~/src/org-mode/lisp/ob-processing hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-processing
~/src/org-mode/lisp/ox-texinfo hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ox-texinfo
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~/src/org-mode/lisp/ob-comint hides /Users/salutis/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/ob-comint

Features:
(shadow bbdb-message mail-extr emacsbug tramp-cmds char-fold
cursor-sensor display-fill-column-indicator org-pomodoro alert log4e
notifications dbus xml gntp org-timer network-stream nsm emms-player-mpd
emms-url emms-player-simple emms-browser sort emms-playlist-sort
emms-last-played emms-volume emms-volume-sndioctl emms-volume-mixerctl
emms-volume-pulse emms-volume-amixer emms-playlist-mode
emms-source-playlist emms-source-file locate emms-cache emms-info
emms-later-do emms emms-compat hl-todo diff-hl log-view vc-dir ewoc
magit-bookmark magit-submodule magit-obsolete magit-blame magit-stash
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magit-remote magit-commit magit-sequence magit-notes magit-worktree
magit-tag magit-merge magit-branch magit-reset magit-files magit-refs
magit-status magit magit-repos magit-apply magit-wip magit-log
which-func magit-diff smerge-mode diff git-commit log-edit message
sendmail yank-media rmc puny rfc822 mml mml-sec epa epg rfc6068
epg-config gnus-util mm-decode mm-bodies mm-encode mail-parse rfc2231
rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev mail-utils
gmm-utils mailheader pcvs-util add-log magit-core magit-autorevert
magit-margin magit-transient magit-process magit-mode magit-git
magit-base magit-section fortune pdf-outline pdf-links pdf-occur
ibuf-ext ibuffer ibuffer-loaddefs tablist tablist-filter
semantic/wisent/comp semantic/wisent semantic/wisent/wisent
semantic/util-modes semantic/util semantic semantic/tag semantic/lex
semantic/fw mode-local cedet pdf-isearch pdf-misc pdf-tools pdf-view
jka-compr pdf-cache pdf-info pdf-util pdf-macs image-mode exif
pdf-loader lingua-franca flyspell-correct flyspell ispell citar-org
oc-basic citar crm citar-file oc-csl citeproc citeproc-itemgetters
citeproc-biblatex citeproc-bibtex parsebib ol-bibtex citeproc-cite
citeproc-subbibs citeproc-sort citeproc-name citeproc-formatters
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citeproc-generic-elements citeproc-macro citeproc-choose citeproc-date
citeproc-context citeproc-prange citeproc-style citeproc-locale
citeproc-term citeproc-rt citeproc-lib citeproc-s let-alist queue bibtex
org-clock ob-sqlite ob-sql ob-java ob-shell ob-C cc-mode cc-fonts
cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs
ob-R ob-scheme org-habit ox-texinfo ox-md ox-odt rng-loc rng-uri
rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns
nxml-enc xmltok nxml-util ox-latex ox-icalendar org-agenda ox-html table
ox-ascii ox-publish ox org-element org-persist xdg org-id org-refile
avl-tree vterm face-remap term disp-table ehelp vterm-module term/xterm
xterm consult-vertico consult recentf tree-widget bookmark marginalia
vertico-mouse vertico orderless corfu dired dired-loaddefs cap-words
superword subword saveplace bug-reference autorevert filenotify
flymake-proc flymake pass f dash s imenu password-store auth-source-pass
with-editor server vc-mtn vc-hg vc-git diff-mode vc-bzr vc-src vc-sccs
vc-svn vc-cvs vc-rcs vc vc-dispatcher modus-operandi-theme modus-themes
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native-compile emacs)

Memory information:
((conses 16 764368 203626)
 (symbols 48 44403 6)
 (strings 32 203179 39675)
 (string-bytes 1 7446564)
 (vectors 16 78683)
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-- 
"The introduction of suitable abstractions is our only mental aid to
organize and master complexity."
-- Edsger Wybe Dijkstra, 1930-2002

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#54634: 29.0.50; Off-by-one highlighting

[Eli Zaretskii]

> Date: Wed, 30 Mar 2022 08:36:38 +0200
> From:  Rudolf Adamkovič via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 1. emacs -Q
> 2. type M-: (setq show-paren-style ‘expression) RET
> 3. type M-: (set show-paren-priority 0) RET
> 4. type (foo)
> 5. type C-a to move to the beginning of the line
> 6. type C-M-@ to highlight the expression "(foo)"
> 
> EXPECTED:
> 
> The entire expression "(foo)" has active region highlight drawn over it
> (matching what gets copied on M-w).
> 
> ACTUAL:
> 
> "(" has the parenthesis highlight and "foo)" has the active region
> highlight (NOT matching what gets copied on M-w).

I don't think this is a bug, it's actually a (subtle) feature.  Your
expectations are inaccurate, and the actual behavior is not only
intended, but IMNSHO also makes more sense than what you expected,
because under your expected behavior would not show the matching
parentheses.

bug#54634: 29.0.50; Off-by-one highlighting

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

Eli Zaretskii <eliz@gnu.org> writes:

> [...], but IMNSHO also makes more sense than what you expected,
> because under your expected behavior would not show the matching
> parentheses.

I do not understand.  In the situation I describe, Emacs does *not*
highlight the matching parentheses, just the opening parenthesis.

Rudy
-- 
"It is no paradox to say that in our most theoretical moods we may be
nearest to our most practical applications."
-- Alfred North Whitehead, 1861-1947

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#54634: 29.0.50; Off-by-one highlighting

[Eli Zaretskii]

> From: Rudolf Adamkovič <salutis@me.com>
> Cc: 54634@debbugs.gnu.org
> Date: Sun, 03 Apr 2022 17:08:51 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > [...], but IMNSHO also makes more sense than what you expected,
> > because under your expected behavior would not show the matching
> > parentheses.
> 
> I do not understand.  In the situation I describe, Emacs does *not*
> highlight the matching parentheses, just the opening parenthesis.

I meant under the default value of show-paren-style.

bug#54634: 29.0.50; Off-by-one highlighting

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

Eli Zaretskii <eliz@gnu.org> writes:

> I meant under the default value of show-paren-style.

Yes, the current behavior makes sense under the default style, but when
highlighting parenthesized expressions, it does not.  Instead, it causes
confusion.  For example, it makes me worry that Emacs will copy the
marked expression without the opening parenthesis.  Given that the
highlight exists to help the user, and not to confuse them, I decided to
report this bug.  I hope it all makes sense.

Rudy
-- 
"Be especially critical of any statement following the word
'obviously.'"
-- Anna Pell Wheeler, 1883-1966

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#54634: 29.0.50; Off-by-one highlighting

[Eli Zaretskii]

> From: Rudolf Adamkovič <salutis@me.com>
> Cc: 54634@debbugs.gnu.org
> Date: Wed, 06 Apr 2022 07:35:08 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I meant under the default value of show-paren-style.
> 
> Yes, the current behavior makes sense under the default style, but when
> highlighting parenthesized expressions, it does not.  Instead, it causes
> confusion.  For example, it makes me worry that Emacs will copy the
> marked expression without the opening parenthesis.  Given that the
> highlight exists to help the user, and not to confuse them, I decided to
> report this bug.  I hope it all makes sense.

If you can suggest a better setting for the priority/priorities of the
two involved overlays, perhaps we could change the priority only when
this style of show-paren-mode is used, and that would be an okay
solution.

bug#54634: 29.0.50; Off-by-one highlighting

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

Eli Zaretskii <eliz@gnu.org> writes:

> If you can suggest a better setting for the priority/priorities of the
> two involved overlays, perhaps we could change the priority only when
> this style of show-paren-mode is used, and that would be an okay
> solution.

Eli, thank you for the reply!

In the reproduction case above, I would expect the active region highlight to
take precedence over the parenthesized expression highlight.  Effectively, the
active region highlight should cover the entire expression, including both of
its parentheses, rendering the expression highlight itself hidden.

I see two issues in play here:

(1) The priority, when using this particular style, does not make much sense.
For myself, I work around the issue as follows:

> Highlight parenthesized expressions with lower priority to avoid covering
> more important highlights, such as the active region highlight provided by
> the Transient Mark mode.
> 
> #+BEGIN_SRC emacs-lisp
> (setq show-paren-priority 0)
> #+END_SRC

(2) If we decide to fix the priority, then that uncovers the off-by-one active
region highlight bug that I reported.  I have waited for a couple of months
with reporting the bug to become sure that this configuration makes sense and
the highlight continues to confuse me.  It does and it does.

Rudy
-- 
"Be especially critical of any statement following the word
'obviously.'"
-- Anna Pell Wheeler, 1883-1966

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia