GNU bug report logs - #76064
31.0.50; Display issue with flymake-show-diagnostics-at-end-of-line

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Date: Wed, 5 Feb 2025 16:45:07 +0100
From: Ergus <spacibba@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#76064: 31.0.50; Display issue with
 flymake-show-diagnostics-at-end-of-line
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Hi Eli:

Looking at your suggestions I have my opinion I will share just in case
you care:

. don't change anything and live with the minor irregularity in the
    cursor positioning in what I consider to be rare cases
    - variation: turn on truncate-lines in such cases

Given that flymake has the new feature this is not an option. The issue
is pretty annoying and not infrequent at all. I think that this feature
was added because vscode and other editors around already have it, so I
expect it to become popular.

  . don't put the 'cursor' property on the diagnostic, in which case
    C-n will place the cursor after the end of the diagnostic on the
    screen line where the diagnostic ends

Maybe we need an extra property like at-end or something similar, to
indicate that the overlay does not belong to the line at all for
navigation purposes.

  . put the 'cursor' property at the last character of the diagnostic
    string, and have it displayed there

  . calculate the character on which to put the 'cursor' property
    dynamically using some convoluted logic

I don't understand how these two may fix the issue. At least not the 3
symptoms I described in the bug report.

  . implement display of diagnostics in a tooltip instead

IIUC this may be very slow right? How many tooltips will be needed?

I think that we are just missing some property in the overlay that
basically means "this text doesn't exist at all".

Is it really that hard?







On Wed, Feb 05, 2025 at 03:46:45PM +0200, Eli Zaretskii wrote:
>> Date: Wed, 05 Feb 2025 00:24:32 +0100
>> From:  Ergus via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>>
>> I have been using flymake-show-diagnostics-at-end-of-line for a while
>> and I have noticed that the inlined diagnostics behaves wrongly.
>>
>> 1. If I am in a line with a diagnostic at the end, and I do C-e, the
>> cursor goes to the end of the diagnostic instead to the end of the line.
>>
>> 2. If after that I do C-a nothing happens, the cursor "stock" there
>> until I leave the line. Left or right arrow don't work either.
>>
>> 3. If we are in the last line and it has a diagnostic, it is impossible
>> to write at the end of the line because the cursor jumps constantly to
>> the end of the diagnostic when typing.
>
>This is bug#73863.  I explained why this happens in that bug, see
>
>  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=73863#35
>
>I proposed several potential solutions for that here:
>
>  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=73863#62
>
>(and a couple of other ideas elsewhere in that discussion).  But
>AFAIU, none of the suggestions were acceptable, so here we are.

Message received at 76064 <at> debbugs.gnu.org:

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To: Ergus <spacibba@HIDDEN>, sbaugh@HIDDEN
In-Reply-To: <87ikpp5m4v.fsf@HIDDEN> (bug-gnu-emacs@HIDDEN)
Subject: Re: bug#76064: 31.0.50;
 Display issue with flymake-show-diagnostics-at-end-of-line
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> Date: Wed, 05 Feb 2025 00:24:32 +0100
> From:  Ergus via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> I have been using flymake-show-diagnostics-at-end-of-line for a while
> and I have noticed that the inlined diagnostics behaves wrongly.
> 
> 1. If I am in a line with a diagnostic at the end, and I do C-e, the
> cursor goes to the end of the diagnostic instead to the end of the line.
> 
> 2. If after that I do C-a nothing happens, the cursor "stock" there
> until I leave the line. Left or right arrow don't work either.
> 
> 3. If we are in the last line and it has a diagnostic, it is impossible
> to write at the end of the line because the cursor jumps constantly to
> the end of the diagnostic when typing.

This is bug#73863.  I explained why this happens in that bug, see

  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=73863#35

I proposed several potential solutions for that here:

  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=73863#62

(and a couple of other ideas elsewhere in that discussion).  But
AFAIU, none of the suggestions were acceptable, so here we are.

Message received at submit <at> debbugs.gnu.org:

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From: Ergus <spacibba@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.0.50; Display issue with flymake-show-diagnostics-at-end-of-line
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Hi:

I have been using flymake-show-diagnostics-at-end-of-line for a while
and I have noticed that the inlined diagnostics behaves wrongly.

1. If I am in a line with a diagnostic at the end, and I do C-e, the
cursor goes to the end of the diagnostic instead to the end of the line.

2. If after that I do C-a nothing happens, the cursor "stock" there
until I leave the line. Left or right arrow don't work either.

3. If we are in the last line and it has a diagnostic, it is impossible
to write at the end of the line because the cursor jumps constantly to
the end of the diagnostic when typing.



In GNU Emacs 31.0.50 (build 10, x86_64-pc-linux-gnu, GTK+ Version
 3.24.48, cairo version 1.18.2) of 2025-02-04 built on RTX
Repository revision: b4eb59a6a931a2d2751e155ec1a5082cab5e8509
Repository branch: project
System Description: Arch Linux

Configured using:
 'configure --prefix=/home/ergo/.local/ --with-mailutils --with-pgtk
 --with-modules --with-cairo --with-harfbuzz
 --with-native-compilation=aot
 '--program-transform-name=s/^ctags$/ctags.emacs/''

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

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

Major mode: Lisp Interaction

Minor modes in effect:
  global-auto-revert-mode: t
  recentf-mode: t
  electric-pair-mode: t
  whitespace-mode: t
  flyspell-mode: t
  completion-preview-mode: t
  diff-hl-margin-mode: t
  global-corfu-mode: t
  corfu-mode: t
  project-multi-mode: t
  gtags-mode: t
  repeat-mode: t
  xterm-mouse-mode: t
  xclip-mode: t
  override-global-mode: t
  winner-mode: t
  save-place-mode: t
  delete-selection-mode: t
  savehist-mode: t
  global-display-fill-column-indicator-mode: t
  display-fill-column-indicator-mode: t
  global-display-line-numbers-mode: t
  display-line-numbers-mode: t
  which-key-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  context-menu-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
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/mnt/casa/gits/emacs_clones/gtags-mode/gtags-mode hides /home/ergo/.config/emacs/elpa/gtags-mode-1.8.2/gtags-mode
/home/ergo/.config/emacs/elpa/transient-20250201.1314/transient hides /home/ergo/.local/share/emacs/31.0.50/lisp/transient

Features:
(shadow sort mail-extr autorevert filenotify recentf tree-widget
wid-edit ffap thingatpt emacsbug elec-pair whitespace flyspell-correct
flyspell ispell completion-preview diff-hl-margin diff-hl-dired diff-hl
log-view log-edit message sendmail yank-media puny citre-lang-fileref
citre-tags citre-ctags citre-readtags citre-readtags-tables
citre-backend-interface citre-common-tag rx citre-common-util dired-x
dired dired-loaddefs rfc822 mml mml-sec epa derived epg rfc6068
epg-config gnus-util text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums
mail-prsvr mailabbrev mail-utils gmm-utils mailheader add-log pcvs-util
vc-dir ewoc vc vc-dispatcher diff-mode track-changes corfu
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xterm init repeat markdown-ts-mode treesit cape compat
use-package-ensure package browse-url xdg url url-proxy url-privacy
url-expand url-methods url-history url-cookie generate-lisp-file
url-domsuf url-util mailcap url-handlers url-parse auth-source eieio
eieio-core cl-macs icons password-cache json subr-x map url-vars
use-package-diminish xt-mouse xclip edmacro kmacro byte-opt
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nasm-mode-autoloads neotree-autoloads nftables-mode-autoloads
nginx-mode-autoloads notmuch-autoloads objed-autoloads
opencl-mode-autoloads paradox-autoloads phi-search-autoloads
pkg-info-autoloads epl-autoloads pkgbuild-mode-autoloads
platformio-mode-autoloads async-autoloads plz-autoloads popon-autoloads
popup-autoloads projectile-autoloads projection-autoloads
protobuf-mode-autoloads protobuf-ts-mode-autoloads
ptemplate-templates-autoloads ptemplate-autoloads
py-vterm-interaction-autoloads scopeline-autoloads
shell-command+-autoloads slime-autoloads macrostep-autoloads
sphinx-mode-autoloads f-autoloads dash-autoloads s-autoloads
spinner-autoloads ssh-config-mode-autoloads string-inflection-autoloads
sudo-edit-autoloads systemd-autoloads tmux-mode-autoloads
transient-autoloads tsc-autoloads urgrep-autoloads vdiff-autoloads
hydra-autoloads lv-autoloads vterm-toggle-autoloads vterm-autoloads
vundo-autoloads which-key-posframe-autoloads posframe-autoloads
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term/pgtk-win pgtk-win term/common-win touch-screen pgtk-dnd tool-bar
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isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
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tibetan thai tai-viet lao 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
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hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo gtk pgtk
lcms2 multi-tty move-toolbar make-network-process tty-child-frames
native-compile emacs)

Memory information:
((conses 16 192993 61392) (symbols 48 15750 2)
 (strings 32 55861 16121) (string-bytes 1 1888131) (vectors 16 20259)
 (vector-slots 8 236738 29574) (floats 8 108 60) (intervals 56 1234 0)
 (buffers 992 11))