bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts

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bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts

Aaron Jensen
Unfortunately, the repro isn't clear, but after using Emacs for some
time, the left side of the hollow box point will end up being slightly
thicker than the right side. After this happens, when the point is
moved, it will leave a faint line on the left side of the point.
Restarting emacs will cause the point to be a uniform box.

Note that I only use the hollow box when a window is not active. Also, I
have a hidpi display, so could it possibly be some sort of rounding
error somewhere?


In GNU Emacs 27.0.91 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.20)
 of 2020-07-05 built on pop-os
Repository revision: 247dcb4b1b1b4ea3d50b63d41c4efa58743f610d
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Pop!_OS 20.04 LTS

Recent messages:
config •    1ms • Emacs Lisp
config •    5ms • Clean shutdown
config •    7ms • Enable Default Theme
→★ loaded init.el in   93 ms
Explain-pause-mode enabled.
LSP :: ruby-ls:1891877 initialized successfully
Quit
Waiting for git... [2 times]
Appointment reminders enabled (no diary file found)
Added 5 events for today

Configured using:
 'configure --with-json'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND GPM DBUS GSETTINGS GLIB NOTIFY INOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER LCMS2 GMP

Important settings:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: EnhRuby

Minor modes in effect:
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  magit-file-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  eval-sexp-fu-flash-mode: t
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  lsp-managed-mode: t
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  evil-traces-mode: t
  global-evil-collection-unimpaired-mode: t
  evil-collection-unimpaired-mode: t
  global-evil-mc-mode: t
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  global-evil-matchit-mode: t
  evil-matchit-mode: t
  global-evil-surround-mode: t
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  ws-butler-mode: t
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  leader-key-leader-override-mode: t
  global-leader-key-leader-override-mode: t
  delete-selection-mode: t
  savehist-mode: t
  xterm-mouse-mode: t
  override-global-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
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  line-number-mode: t
  auto-fill-function: yas--auto-fill
  transient-mark-mode: t
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/home/aaronjensen/.emacs.d/straight/build/org/ob-eshell hides
/usr/local/share/emacs/27.0.91/lisp/org/ob-eshell
/home/aaronjensen/.emacs.d/straight/build/org/ol-irc hides
/usr/local/share/emacs/27.0.91/lisp/org/ol-irc
/home/aaronjensen/.emacs.d/straight/build/org/org-archive hides
/usr/local/share/emacs/27.0.91/lisp/org/org-archive
/home/aaronjensen/.emacs.d/straight/build/let-alist/let-alist hides
/usr/local/share/emacs/27.0.91/lisp/emacs-lisp/let-alist

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Memory information:
((conses 16 709518 827723)
 (symbols 48 63320 464)
 (strings 32 214735 107138)
 (string-bytes 1 7450854)
 (vectors 16 119221)
 (vector-slots 8 2327211 954848)
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 (buffers 1000 26))

Aaron



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bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts

Aaron Jensen
I'm going to try using --with-cairo for a bit to see if that helps.

Aaron



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bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts

Aaron Jensen
Forgot to attach a screenshot.

Aaron

On Mon, Jul 20, 2020 at 6:41 PM Aaron Jensen <[hidden email]> wrote:
>
> I'm going to try using --with-cairo for a bit to see if that helps.
>
> Aaron

Screenshot from 2020-07-20 18-28-30.png (70K) Download Attachment
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bug#42452: 27.0.91; hollow box cursor sometimes leaves artifacts

Eli Zaretskii
In reply to this post by Aaron Jensen
> From: Radon Rosborough <[hidden email]>
> Date: Sun, 28 Mar 2021 15:21:47 -0700
>
> I've attached a patch that appears to resolve the problem for me.
>
> What we are doing in this patch is overriding the graphics context
> configuration so that line_width is set to 1, rather than the default
> of 0. There is somewhat detailed documentation from xlib on the
> meaning of the line_width argument, and how to set it via XChangeGC,
> here: https://tronche.com/gui/x/xlib/GC/manipulating.html
>
> In short, a line_width of 0 means "draw a line of width 1 pixel, but
> use a device-dependent algorithm to do so, which may have higher
> performance". Unlike setting line_width to 1, setting it to 0 does not
> make any guarantees about the exact pixels that are rendered as part
> of the line. Apparently, there is a bug in the X server's
> device-dependent graphics code, or perhaps the graphics driver, which
> causes the "device-dependent algorithm" to be buggy under some
> circumstances, and draw a line of width 2 when a line of width 1 is
> requested.

Since this happens for unknown reasons, most probably some misfeature
of the X server, the change to use an explicit line thickness is a
debugging device.  As such, it shouldn't be the default; instead,
let's have a Lisp variable that gives the thickness, by default zero,
and let users affected by this issue set the variable to whatever
value that fixes the problem.

> Other interesting behavior: If I set line_width explicitly to 2 rather
> than to 1, then the graphical artifacts mentioned in the initial bug
> report occur unconditionally, every time a hollow box cursor is
> rendered.

I cannot see anything when I go to the URL you posted, just a blank
screen (a frequent problem with imgur.com), so I don't think I
understand what "artifacts" are you alluding to.  Does Emacs leave
traces of the hollow cursor when it moves it to another location?  Or
are you alluding to the different thickness of some of the borders of
the cursor?

Thanks.