GNU bug report logs - #59320
29.0.50; (Windows) Cursor is invisble unless inhibit-double-buffer is t, and then it only appears as a single pixel line

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Casey Banner <kcbanner <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; (Windows) Cursor is invisble unless inhibit-double-buffer is
 t, and then it only appears as a single pixel line
Date: Wed, 16 Nov 2022 11:25:58 -0500

This occurs in my config as well as emacs -Q. The cursor is invisible,
unless I enable inhibit-double-buffer. Then it appears but only a
single line regardless of the cursor-type setting.

A video of the issue here: https://imgur.com/f8nepbE

Thanks!,
Casey

In GNU Emacs 29.0.50 (build 3, x86_64-w64-mingw32) of 2022-11-16 built
 on DESKTOP-EK25TL1
Repository revision: f793add1758fd01f678698a90f5847b575f63cf8
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 10.0.19044
System Description: Microsoft Windows 10 Pro (v10.0.2009.19044.2251)

Configured using:
 'configure --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32
 --build=x86_64-w64-mingw32 --prefix=/e/dev/emacs-src --without-dbus
 --without-pop --with-native-compilation --with-cairo --with-harfbuzz
 --with-xml2 --without-compress-install --with-json 'CFLAGS=-O2
 -mtune=native -march=native -fomit-frame-pointer -pipe
 -ftree-vectorize' --with-pgtk'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP XPM ZLIB

Important settings:
  value of $LANG: ENC
  locale-coding-system: cp1252

Major mode: ELisp/d

Minor modes in effect:
  shell-dirtrack-mode: t
  recentf-mode: t
  display-line-numbers-mode: t
  which-key-mode: t
  solaire-global-mode: t
  company-box-mode: t
  company-tng-mode: t
  global-company-mode: t
  company-mode: t
  global-auto-revert-mode: t
  ivy-prescient-mode: t
  ivy-posframe-mode: t
  ivy-mode: t
  delete-selection-mode: t
  minions-mode: t
  doom-modeline-mode: t
  override-global-mode: t
  global-smartscan-mode: t
  smartscan-mode: t
  global-hl-line-mode: t
  gcmh-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  straight-symlink-emulation-mode: t
  straight-live-modifications-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
  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:
c:/Users/kcbanner/.emacs.d/straight/build/ws-trim/ws-trim hides
~/.emacs.d/elisp/ws-trim
c:/Users/kcbanner/.emacs.d/straight/build/transient/transient hides
e:/dev/emacs-src/share/emacs/29.0.50/lisp/transient
c:/Users/kcbanner/.emacs.d/straight/build/let-alist/let-alist hides
e:/dev/emacs-src/share/emacs/29.0.50/lisp/emacs-lisp/let-alist

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Memory information:
((conses 16 833099 372824)
 (symbols 48 36148 6)
 (strings 32 210572 89136)
 (string-bytes 1 6026076)
 (vectors 16 140055)
 (vector-slots 8 2575699 981150)
 (floats 8 1844 2152)
 (intervals 56 2092 1612)
 (buffers 984 21))

Message #8 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Casey Banner <kcbanner <at> gmail.com>
Cc: 59320 <at> debbugs.gnu.org
Subject: Re: bug#59320: 29.0.50; (Windows) Cursor is invisble unless
 inhibit-double-buffer is t, and then it only appears as a single pixel
 line
Date: Thu, 17 Nov 2022 10:07:37 +0800

Casey Banner <kcbanner <at> gmail.com> writes:

> This occurs in my config as well as emacs -Q. The cursor is invisible,
> unless I enable inhibit-double-buffer. Then it appears but only a
> single line regardless of the cursor-type setting.
>
> A video of the issue here: https://imgur.com/f8nepbE

I can't open that page.  Would you please post it as a link?

Also, at present, I don't have access to any MS Windows machine where
debugging Emacs is easy.  So if someone else could look into that I'd be
quite grateful.

>  -ftree-vectorize' --with-pgtk'

BTW, --with-pgtk is not useful on MS Windows.

Message #11 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Casey Banner <kcbanner <at> gmail.com>, 59320 <at> debbugs.gnu.org
Subject: Re: bug#59320: 29.0.50; (Windows) Cursor is invisble unless
 inhibit-double-buffer is t, and then it only appears as a single pixel
 line
Date: Thu, 17 Nov 2022 08:18:26 +0530

[வியாழன் நவம்பர் 17, 2022] Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> Casey Banner <kcbanner <at> gmail.com> writes:
>
>> This occurs in my config as well as emacs -Q. The cursor is invisible,
>> unless I enable inhibit-double-buffer. Then it appears but only a
>> single line regardless of the cursor-type setting.
>>
>> A video of the issue here: https://imgur.com/f8nepbE
>
> I can't open that page.  Would you please post it as a link?

How about this https://i.bcow.xyz/f8nepbE.mp4?
[ To those who are wondering, i.bcow.xyz is an instance of an alternate
  imgur frontend called rimgo.  ]

Message #14 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: Casey Banner <kcbanner <at> gmail.com>, 59320 <at> debbugs.gnu.org
Subject: Re: bug#59320: 29.0.50; (Windows) Cursor is invisble unless
 inhibit-double-buffer is t, and then it only appears as a single pixel
 line
Date: Thu, 17 Nov 2022 11:26:26 +0800

Visuwesh <visuweshm <at> gmail.com> writes:

> [வியாழன் நவம்பர் 17, 2022] Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:
>
>> Casey Banner <kcbanner <at> gmail.com> writes:
>>
>>> This occurs in my config as well as emacs -Q. The cursor is invisible,
>>> unless I enable inhibit-double-buffer. Then it appears but only a
>>> single line regardless of the cursor-type setting.
>>>
>>> A video of the issue here: https://imgur.com/f8nepbE
>>
>> I can't open that page.  Would you please post it as a link?
>
> How about this https://i.bcow.xyz/f8nepbE.mp4?
> [ To those who are wondering, i.bcow.xyz is an instance of an alternate
>   imgur frontend called rimgo.  ]

Casey, do you have w32_use_visible_system_caret set to t?  That's the
only possibly related thing I can see in w32term.c.

Message #17 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Casey Banner <kcbanner <at> gmail.com>
To: 59320 <at> debbugs.gnu.org
Subject: Re: bug#59320: Acknowledgement (29.0.50; (Windows) Cursor is invisble
 unless inhibit-double-buffer is t,
 and then it only appears as a single pixel line)
Date: Mon, 21 Nov 2022 23:01:27 -0500

Apologies for my slow response, I thought I was subscribed to mails
for responses here.

>>> Casey, do you have w32_use_visible_system_caret set to t?  That's the
>>> only possibly related thing I can see in w32term.c.

Aha, yes! Setting this to nil restores my cursor back to normal. I
hadn't started using a screen reader,
but it seems that enabling the "Turn on Speech Recognition" feature
triggers this to be set via the
SPI_GETSCREENREADER flag. I can verify disabling this feature then
opening emacs displays
causes w32_use_visible_system_caret to be nil, but enabling it causes
it to be t.

Thanks for looking into this for me!

Cheers,
Casey

Message #20 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Casey Banner <kcbanner <at> gmail.com>, Po Lu <luangruo <at> yahoo.com>
Cc: 59320 <at> debbugs.gnu.org
Subject: Re: bug#59320: Acknowledgement (29.0.50;
 (Windows) Cursor is invisble unless inhibit-double-buffer is t, and
 then it only appears as a single pixel line)
Date: Tue, 22 Nov 2022 15:19:54 +0200

> From: Casey Banner <kcbanner <at> gmail.com>
> Date: Mon, 21 Nov 2022 23:01:27 -0500
> 
> >>> Casey, do you have w32_use_visible_system_caret set to t?  That's the
> >>> only possibly related thing I can see in w32term.c.
> 
> Aha, yes! Setting this to nil restores my cursor back to normal. I
> hadn't started using a screen reader,
> but it seems that enabling the "Turn on Speech Recognition" feature
> triggers this to be set via the
> SPI_GETSCREENREADER flag. I can verify disabling this feature then
> opening emacs displays
> causes w32_use_visible_system_caret to be nil, but enabling it causes
> it to be t.

So I guess we should disable double-buffering on Windows when system caret
is in use?

Message #23 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Casey Banner <kcbanner <at> gmail.com>
To: 59320 <at> debbugs.gnu.org
Date: Tue, 22 Nov 2022 11:29:35 -0500

>>> So I guess we should disable double-buffering on Windows when system caret is in use?

That might be a good default for that case. However, I'm not sure if
this is some quirk of my windows settings, graphics driver, refresh
rate, etc. I am happy to run any tests you would need to get more
info.

Message #26 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Casey Banner <kcbanner <at> gmail.com>, 59320 <at> debbugs.gnu.org
Subject: Re: bug#59320: Acknowledgement (29.0.50; (Windows) Cursor is
 invisble unless inhibit-double-buffer is t, and then it only appears as a
 single pixel line)
Date: Wed, 23 Nov 2022 08:42:43 +0800

Eli Zaretskii <eliz <at> gnu.org> writes:

> So I guess we should disable double-buffering on Windows when system caret
> is in use?

I'd only do that if all else fails.  How does MS-Windows display the
system caret, and why can't it be made to work with double-buffering?

Thanks.

Message #29 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: kcbanner <at> gmail.com, 59320 <at> debbugs.gnu.org
Subject: Re: bug#59320: Acknowledgement (29.0.50; (Windows) Cursor is
 invisble unless inhibit-double-buffer is t, and then it only appears as a
 single pixel line)
Date: Wed, 23 Nov 2022 15:44:02 +0200

> From: Po Lu <luangruo <at> yahoo.com>
> Cc: Casey Banner <kcbanner <at> gmail.com>,  59320 <at> debbugs.gnu.org
> Date: Wed, 23 Nov 2022 08:42:43 +0800
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > So I guess we should disable double-buffering on Windows when system caret
> > is in use?
> 
> I'd only do that if all else fails.  How does MS-Windows display the
> system caret, and why can't it be made to work with double-buffering?

I don't know the answer to the second part, but if you search the C sources
for w32_use_visible_system_caret, you will probably see the answer right
away (there aren't many hits).

Message #32 received at 59320 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: kcbanner <at> gmail.com, 59320 <at> debbugs.gnu.org
Subject: Re: bug#59320: Acknowledgement (29.0.50; (Windows) Cursor is
 invisble unless inhibit-double-buffer is t, and then it only appears as a
 single pixel line)
Date: Wed, 23 Nov 2022 21:54:32 +0800

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Po Lu <luangruo <at> yahoo.com>
>> Cc: Casey Banner <kcbanner <at> gmail.com>,  59320 <at> debbugs.gnu.org
>> Date: Wed, 23 Nov 2022 08:42:43 +0800
>> 
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> > So I guess we should disable double-buffering on Windows when system caret
>> > is in use?
>> 
>> I'd only do that if all else fails.  How does MS-Windows display the
>> system caret, and why can't it be made to work with double-buffering?
>
> I don't know the answer to the second part, but if you search the C sources
> for w32_use_visible_system_caret, you will probably see the answer right
> away (there aren't many hits).

Sure, I will give this a look in a bit (I don't have easy access to
Windows right now.)

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