bug#55779: 29.0.50; child frame

bug#55779: 29.0.50; child frame

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

When I build emacs --with-x-toolkit=gtk3, the child frame generated by
corfu completion candidates are blocked by a blank overlay. I can
confirm this is only a gtk3 related issue, because I have built emacs
--with-x-toolkit=athena or --with-x-toolkit=no without facing the same
issue. Also, this issue does not occur on older stable branch,
e.g. 28.1, I can still use gtk3 as the toolkit on older build without
any issues.

I have reached out to the author of corfu mode. The author says he
cannot do anything because it is an issue related to emacs child frame
mechanism. And my experiments on different build configurations showed
the same conclusion.


In GNU Emacs 29.0.50 (build 6, x86_64-pc-linux-gnu, cairo version 1.17.6)
 of 2022-06-03 built on artix
Repository revision: 2340243a312367e225437c7018cd1139afd7e189
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Artix Linux

Configured using:
 'configure --with-native-compilation --with-imagemagick --with-x
 --with-x-toolkit=gtk3 --with-xinput2'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY OLDXMENU PDUMPER PNG RSVG SECCOMP SOUND
SQLITE3 THREADS TIFF WEBP X11 XDBE XIM XINPUT2 XPM ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF8
  value of $LANG: en_US.UTF8
  value of $XMODIFIERS: @im=exwm-xim
  locale-coding-system: utf-8-unix

Major mode: C/*l

Minor modes in effect:
  display-line-numbers-mode: t
  global-auto-revert-mode: t
  electric-pair-mode: t
  display-time-mode: t
  windmove-mode: t
  exwm-firefox-mode: t
  pixel-scroll-precision-mode: t
  sly-symbol-completion-mode: t
  emms-playing-time-display-mode: t
  emms-playing-time-mode: t
  eglot--managed-mode: t
  shell-switcher-mode: t
  corfu-history-mode: t
  global-corfu-mode: t
  corfu-mode: t
  projectile-mode: t
  global-aggressive-indent-mode: t
  aggressive-indent-mode: t
  which-key-mode: t
  marginalia-mode: t
  savehist-mode: t
  vertico-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  mood-line-mode: t
  flymake-mode: t
  org-roam-db-autosync-mode: t
  shell-dirtrack-mode: t
  leaf-key-override-global-mode: t
  straight-use-package-mode: t
  straight-package-neutering-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
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t

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Features:
(shadow mail-extr emacsbug whitespace mule-util orderless cursor-sensor
display-line-numbers init init-shapeless-blog shapeless-blog
shapeless-blog-autoloads init-ui autorevert elec-pair time
init-keybinding windmove init-helpers shapeless-chinese init-exwm
exwm-firefox exwm-firefox-core exwm-firefox-autoloads
exwm-firefox-core-autoloads exwm-edit exwm-edit-autoloads exwm-randr
xcb-randr exwm-xim xcb-xim xcb-xlib exwm exwm-input xcb-keysyms xcb-xkb
exwm-manage exwm-floating xcb-cursor xcb-render exwm-layout
exwm-workspace exwm-core xcb-ewmh xcb-icccm xcb xcb-xproto xcb-types
xcb-debug exwm-autoloads xelb-autoloads init-pixel-scroll-precision
pixel-scroll cua-base init-sly sly sly-completion sly-buttons
sly-messages sly-common apropos arc-mode archive-mode hyperspec
sly-autoloads init-pass pass f password-store with-editor pass-autoloads
password-store-otp-autoloads password-store-autoloads auth-source-pass
init-mentor mentor-autoloads async-autoloads xml-rpc-autoloads
init-lilypond lilypond-mode vc-mtn vc-hg vc-git vc-bzr vc-src vc-sccs
vc-svn vc-cvs vc-rcs log-view pcvs-util vc vc-dispatcher init-json
json-mode-autoloads json-snatcher-autoloads init-notmuch notmuch
notmuch-tree notmuch-jump notmuch-hello notmuch-show notmuch-print
notmuch-crypto notmuch-mua notmuch-message notmuch-draft
notmuch-maildir-fcc notmuch-address notmuch-company notmuch-parser
notmuch-wash diff-mode coolj notmuch-query goto-addr icalendar diary-lib
diary-loaddefs notmuch-tag crm notmuch-lib notmuch-version
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bug#55779: Acknowledgement (29.0.50; child frame)

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

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55779: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=55779
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Po Lu <luangruo@yahoo.com> (Today 18:27) (replied)
Subject: Re: bug#55779: 29.0.50; child frame
To: drshapeless <drsl@drshapeless.com>
Cc: 55779@debbugs.gnu.org
Date: Fri, 03 Jun 2022 18:27:18 +0800

drshapeless <drsl@drshapeless.com> writes:

> When I build emacs --with-x-toolkit=gtk3, the child frame generated by
> corfu completion candidates are blocked by a blank overlay. I can
[ 7 more citation lines. Click/Enter to show. ]
> confirm this is only a gtk3 related issue, because I have built emacs
> --with-x-toolkit=athena or --with-x-toolkit=no without facing the same
> issue. Also, this issue does not occur on older stable branch,
> e.g. 28.1, I can still use gtk3 as the toolkit on older build without
> any issues.
>
> I have reached out to the author of corfu mode. The author says he
> cannot do anything because it is an issue related to emacs child frame
> mechanism. And my experiments on different build configurations showed
> the same conclusion.

What does "are blocked by a blank overlay" mean?  It is technically
impossible for anything (such as an overlay) in the parent frame to
obscure the contents of the child frame, so I'm afraid I don't
understand what you mean by "blocked"?

Secondly, what happens if you start Emacs with
"GDK_CORE_DEVICE_EVENTS=1" in the environment?

Thanks.
 drshapeless <drsl@drshapeless.com> (0 mins. ago) (sent)
 Subject: Re: bug#55779: 29.0.50; child frame
 To: Po Lu <luangruo@yahoo.com>
 Date: Fri, 03 Jun 2022 20:11:43 +0800

 Po Lu <luangruo@yahoo.com> writes:

 > drshapeless <drsl@drshapeless.com> writes:
 >> When I build emacs --with-x-toolkit=gtk3, the child frame generated by
 [ 18 more citation lines. Click/Enter to show. ]
 >> corfu completion candidates are blocked by a blank overlay. I can
 >> confirm this is only a gtk3 related issue, because I have built emacs
 >> --with-x-toolkit=athena or --with-x-toolkit=no without facing the same
 >> issue. Also, this issue does not occur on older stable branch,
 >> e.g. 28.1, I can still use gtk3 as the toolkit on older build without
 >> any issues.
 >>
 >> I have reached out to the author of corfu mode. The author says he
 >> cannot do anything because it is an issue related to emacs child frame
 >> mechanism. And my experiments on different build configurations showed
 >> the same conclusion.
 >
 > What does "are blocked by a blank overlay" mean?  It is technically
 > impossible for anything (such as an overlay) in the parent frame to
 > obscure the contents of the child frame, so I'm afraid I don't
 > understand what you mean by "blocked"?
 >
 > Secondly, what happens if you start Emacs with
 > "GDK_CORE_DEVICE_EVENTS=1" in the environment?
 >
 > Thanks.

 I just tried starting Emacs with "GDK_CORE_DEVICE_EVENTS=1", the only
 difference is the smooth scrolling is gone. The child frame issue still
 persists.

 To be clear, it was said to be a child frame redisplay bug, (by
 minad). It was not the parent frame blocking the child frame, instead it
 seems to be another child frame blocking the child frame.

 You may check out the github issue below, where I posted a couple photos
 showing the bug.

 https://github.com/minad/corfu/issues/161

bug#55779: 29.0.50; child frame

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

drshapeless <drsl@drshapeless.com> writes:

> When I build emacs --with-x-toolkit=gtk3, the child frame generated by
> corfu completion candidates are blocked by a blank overlay. I can
> confirm this is only a gtk3 related issue, because I have built emacs
> --with-x-toolkit=athena or --with-x-toolkit=no without facing the same
> issue. Also, this issue does not occur on older stable branch,
> e.g. 28.1, I can still use gtk3 as the toolkit on older build without
> any issues.
>
> I have reached out to the author of corfu mode. The author says he
> cannot do anything because it is an issue related to emacs child frame
> mechanism. And my experiments on different build configurations showed
> the same conclusion.

What does "are blocked by a blank overlay" mean?  It is technically
impossible for anything (such as an overlay) in the parent frame to
obscure the contents of the child frame, so I'm afraid I don't
understand what you mean by "blocked"?

Secondly, what happens if you start Emacs with
"GDK_CORE_DEVICE_EVENTS=1" in the environment?

Thanks.

bug#55779: 29.0.50; child frame

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

Po Lu <luangruo@yahoo.com> writes:

> drshapeless <drsl@drshapeless.com> writes:
>
>> To be clear, it was said to be a child frame redisplay bug, (by
>> minad). It was not the parent frame blocking the child frame, instead it
>> seems to be another child frame blocking the child frame.
>>
>> You may check out the github issue below, where I posted a couple photos
>> showing the bug.
>>
>> https://github.com/minad/corfu/issues/161
>
> Thanks.  That's very odd, the only parts of the GTK-specific child frame
> support to have changed recently are the parts involving WM frame
> synchronization.  What happens if you comment out all the calls to
> `gdk_x11_window_set_frame_sync_enabled' in xfns.c and xterm.c?

I have commented out 2 calls in xfns.c and 1 call in xterm.c. But the
issue persists. A bit more detailed observation is that, the size of the
blocking overlay (just call it overlay now) is related to the last
completion child frame.

For example, if the last child frame was 3-line tall, if the next child
frame is 5-line tall, only the first 3 lines are blocked.

And still, this behaviour cannot be observed other than building with
gtk. 

bug#55779: 29.0.50; child frame

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

drshapeless <drsl@drshapeless.com> writes:

> I have commented out 2 calls in xfns.c and 1 call in xterm.c. But the
> issue persists. A bit more detailed observation is that, the size of the
> blocking overlay (just call it overlay now) is related to the last
> completion child frame.
>
> For example, if the last child frame was 3-line tall, if the next child
> frame is 5-line tall, only the first 3 lines are blocked.
>
> And still, this behaviour cannot be observed other than building with
> gtk. 

I'm lost.  What happens if you set `x-gtk-resize-child-frames' to
`hide'?

bug#55779: 29.0.50; child frame

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

Po Lu <luangruo@yahoo.com> writes:

> drshapeless <drsl@drshapeless.com> writes:
>
>> I have commented out 2 calls in xfns.c and 1 call in xterm.c. But the
>> issue persists. A bit more detailed observation is that, the size of the
>> blocking overlay (just call it overlay now) is related to the last
>> completion child frame.
>>
>> For example, if the last child frame was 3-line tall, if the next child
>> frame is 5-line tall, only the first 3 lines are blocked.
>>
>> And still, this behaviour cannot be observed other than building with
>> gtk. 
>
> I'm lost.  What happens if you set `x-gtk-resize-child-frames' to
> `hide'?

I have tried this one even before sending the bug report, did not
help. The bug should be something related to gtk related commit in
master but not in 28.1 release. But I could not located it.

bug#55779: 29.0.50; child frame

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

drshapeless <drsl@drshapeless.com> writes:

> I have tried this one even before sending the bug report, did not
> help. The bug should be something related to gtk related commit in
> master but not in 28.1 release. But I could not located it.

I can't think of any either.  Did you try setting
`x-gtk-resize-child-frames' to `resize-mode' as well?

bug#55779: 29.0.50; child frame

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

Po Lu <luangruo@yahoo.com> writes:

> I can't think of any either.  Did you try setting
> `x-gtk-resize-child-frames' to `resize-mode' as well?

Yes I have tried that one as well, did not solve the issue.

The "blocking" will go away as long as I update the drop list item,
e.g. using C-n to select the next item. Could a workaround be forcing
the child frame to update twice at creation?

bug#55779: 29.0.50; child frame

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

drshapeless <drsl@drshapeless.com> writes:

> Yes I have tried that one as well, did not solve the issue.
>
> The "blocking" will go away as long as I update the drop list item,
> e.g. using C-n to select the next item. Could a workaround be forcing
> the child frame to update twice at creation?

No, I don't think so (what does "update" mean here anyway?)

Besides, it used to work in Emacs 28.  Could you try using "git bisect"
to isolate the commit responsible for this problem?

Thanks.

bug#55779: 29.0.50; child frame

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

Po Lu <luangruo@yahoo.com> writes:

> No, I don't think so (what does "update" mean here anyway?)
>
> Besides, it used to work in Emacs 28.  Could you try using "git bisect"
> to isolate the commit responsible for this problem?
>
> Thanks.

After a couple of hours, I am able to locate the bad commit using "git
bisect". Here's the log. You probably made a change in GTK back in April
leading to this bug.

git bisect start 'master' 'emacs-28.1'
0a5477b448 bad Make skkdic-convert replacements literal
5a223c7f2e good Update logs and HISTORY for Emacs 28.1

git bisect good 96867f9d0897319adda9d7b8ec84c1fb9e451225
96867f9d08 good Fix manual points about tex-latex-block/latex-insert-block

git bisect good 095a776d0642bced88a6357f2d889c8980e0b83a
095a776d06 good Clean up various bits of Haiku code

git bisect bad 3c5e1f8ec8d5d52e5bbf185d9618852e7d04e3ca
3c5e1f8ec8 bad Simplify Haiku selection code

git bisect bad c7d49f91dac8afeb85cb8ee2b209f7ca4b363a4d
c7d49f91da bad Fix another help-fns--insert-menu-bindings parsing problem

git bisect good 5c7b5c65ada6c07509a46ec459bf3a3aea3a6386
5c7b5c65ad good ; * doc/emacs/mini.texi (Completion Commands): Remove duplicate @findex.

git bisect bad 9b6580ccb73e6cb71a89099bb7062689cbed9e20
9b6580ccb7 bad Speed up color cache lookup on X

git bisect bad 26e448ae2b60bd34eebceca6dbd181ca1722be5b
26e448ae2b bad ; Merge from origin/emacs-28

git bisect bad 247e587d56f9be5164b3783e04cfba73fd667175
247e587d56 bad Document how to specify fallback modes

git bisect bad d78e4460727c348fb5a5a62b774797c4374a1190
d78e446072 bad Minor cleanups to Haiku menu code

git bisect good 5fae0325872710dcbf42541b985103b66f613f61
5fae032587 good Tell those using exclusively X not to use the PGTK port

git bisect good 9751250adb1333da55fcadb363266214d0782bb9
9751250adb good Port struct Lisp_Subr to C99

git bisect bad 92667cc2fb17af947c202d2de765d8736679e858
92667cc2fb bad Fix last change for GTK 2

git bisect good 4dd47196f67a223abf482caf430c3e5dd5c05977
4dd47196f6 good Fix opaque region treatment on GTK 3

92667cc2fb17af947c202d2de765d8736679e858 is the first bad commit
commit 92667cc2fb17af947c202d2de765d8736679e858
Author: Po Lu <luangruo@yahoo.com>
Date:   Tue Apr 19 11:18:25 2022 +0800
    Fix last change for GTK 2
    
    * src/xfns.c (x_set_alpha_background):
    * src/xterm.c (x_update_opaque_region): Move some ifdefs around.
 src/xfns.c  |  2 +-
 src/xterm.c | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

bug#55779: 29.0.50; child frame

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

drshapeless <drsl@drshapeless.com> writes:

> After a couple of hours, I am able to locate the bad commit using "git
> bisect". Here's the log. You probably made a change in GTK back in April
> leading to this bug.

Thanks, but that doesn't make much sense.  Updating a window's opaque
region by calling its `style_changed' function shouldn't interfere with
updating it or changing its size.

What happens if you comment out this part out?

      object_class = G_OBJECT_GET_CLASS (FRAME_GTK_OUTER_WIDGET (f));
      class = GTK_WIDGET_CLASS (object_class);

      if (class->style_updated)
	class->style_updated (FRAME_GTK_OUTER_WIDGET (f));

Thanks.

bug#55779: 29.0.50; child frame

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

Po Lu <luangruo@yahoo.com> writes:

> Thanks, but that doesn't make much sense.  Updating a window's opaque
> region by calling its `style_changed' function shouldn't interfere with
> updating it or changing its size.
>
> What happens if you comment out this part out?
>
>       object_class = G_OBJECT_GET_CLASS (FRAME_GTK_OUTER_WIDGET (f));
>       class = GTK_WIDGET_CLASS (object_class);
>
>       if (class->style_updated)
> 	class->style_updated (FRAME_GTK_OUTER_WIDGET (f));
>
> Thanks.

If I comment this part out, even at the lastest master commit, the issue
is solved. I could say these few lines of code is the root of the bug.

I have no idea what is going on though.

bug#55779: 29.0.50; child frame

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

drshapeless <drsl@drshapeless.com> writes:

> If I comment this part out, even at the lastest master commit, the issue
> is solved. I could say these few lines of code is the root of the bug.
>
> I have no idea what is going on though.

Thanks.  I didn't quite figure that out either.

Does this also fix the problem?

diff --git a/src/xterm.c b/src/xterm.c
index 2bf37e94d6..7f9d4c6ff6 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -4349,11 +4349,16 @@ x_update_opaque_region (struct frame *f, XEvent *configure)
 		     (unsigned char *) &opaque_region, 4);
   else
     {
-      object_class = G_OBJECT_GET_CLASS (FRAME_GTK_OUTER_WIDGET (f));
-      class = GTK_WIDGET_CLASS (object_class);
+      /* This causes child frames to not update correctly for an
+	 unknown reason.  (bug#55779) */
+      if (!FRAME_PARENT_FRAME (f))
+	{
+	  object_class = G_OBJECT_GET_CLASS (FRAME_GTK_OUTER_WIDGET (f));
+	  class = GTK_WIDGET_CLASS (object_class);
 
-      if (class->style_updated)
-	class->style_updated (FRAME_GTK_OUTER_WIDGET (f));
+	  if (class->style_updated)
+	    class->style_updated (FRAME_GTK_OUTER_WIDGET (f));
+	}
     }
 #endif
   unblock_input ();

bug#55779: 29.0.50; child frame

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

Po Lu <luangruo@yahoo.com> writes:

> Thanks.  I didn't quite figure that out either.
>
> Does this also fix the problem?
>
> diff --git a/src/xterm.c b/src/xterm.c
> index 2bf37e94d6..7f9d4c6ff6 100644
> --- a/src/xterm.c
> +++ b/src/xterm.c
> @@ -4349,11 +4349,16 @@ x_update_opaque_region (struct frame *f, XEvent *configure)
>  		     (unsigned char *) &opaque_region, 4);
>    else
>      {
> -      object_class = G_OBJECT_GET_CLASS (FRAME_GTK_OUTER_WIDGET (f));
> -      class = GTK_WIDGET_CLASS (object_class);
> +      /* This causes child frames to not update correctly for an
> +	 unknown reason.  (bug#55779) */
> +      if (!FRAME_PARENT_FRAME (f))
> +	{
> +	  object_class = G_OBJECT_GET_CLASS (FRAME_GTK_OUTER_WIDGET (f));
> +	  class = GTK_WIDGET_CLASS (object_class);
>  
> -      if (class->style_updated)
> -	class->style_updated (FRAME_GTK_OUTER_WIDGET (f));
> +	  if (class->style_updated)
> +	    class->style_updated (FRAME_GTK_OUTER_WIDGET (f));
> +	}
>      }
>  #endif
>    unblock_input ();

Yes this also solves the bug. Weird.

bug#55779: 29.0.50; child frame

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

drshapeless <drsl@drshapeless.com> writes:

> Yes this also solves the bug. Weird.

Thanks, installed.  I'm closing this bug then.