bug#74590: 31.0.50 [scratch/igc branch]; key input sometimes skip fcitx input method preedit box

bug#74590: 31.0.50 [scratch/igc branch]; key input sometimes skip fcitx input method preedit box

[Yikai Zhao]

I encountered this bug while testing the mps (scratch/igc) branch. I
cannot reproduce this with the current master branch.

I'm running Linux, X11, fcitx chinese input method.

Fcitx input method is popular among CJK users. When it's enabled, all
character inputs should be displayed in the "fcitx preedit box"; until a
confirmation key (e.g. space) is pressed, the composed characters should
then be inserted into the application (e.g. emacs).

Now, with the mps branch, occasinoally, some key input would NOT go to
the fcitx preedit box; instead, it goes into emacs directly. It happens
regardless of whether the fcitx preedit box is currently active. (aka,
both first-chars and non-first-chars may have this problem). If the
fcitx preedit box is active when is happens, it would remain active.

For example, when I type "niha", it starts at this:

+----------emacs buffer---------------+
| xxxxxx|                             |
|       +-----fcitx box-------+       |
|       | niha                |       |
|       | 你好 你哈 你害 ..   |       |
|       +---------------------+       |
|                                     |
+-------------------------------------+

Then I type "o", the expected behavior is:

+----------emacs buffer---------------+
| xxxxxx|                             |
|       +-----fcitx box-------+       |
|       | nihao               |       |
|       | 你好 你哈 你害 ..   |       |
|       +---------------------+       |
|                                     |
+-------------------------------------+

But instead, what I get is:

+----------emacs buffer---------------+
| xxxxxxo|                             |
|       +-----fcitx box-------+       |
|       | niha                |       |
|       | 你好 你哈 你害 ..   |       |
|       +---------------------+       |
|                                     |
+-------------------------------------+


In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.22.30, cairo version 1.15.10) of 2024-11-24 built on f2908c960c38
Repository revision: 0756b1f2f5452d715396f66d887c137776e360ca
Repository branch: scratch/igc
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.5 LTS

Configured using:
 'configure --prefix=/work/dist/AppDir --disable-locallisppath
 --with-native-compilation=aot --with-json --with-threads --with-sqlite3
 --with-tree-sitter --with-dbus --with-xml2 --with-modules --with-libgmp
 --with-gpm --with-lcms2 --with-mps --with-x --without-pgtk
 --without-gconf --with-x-toolkit=gtk3 --with-xft --without-tiff
 --without-imagemagick --with-gif --with-png --with-rsvg --with-webp
 --with-harfbuzz --with-cairo --with-libotf --without-m17n-flt
 --with-jpeg emacs_cv_jpeglib=/usr/lib/x86_64-linux-gnu/libjpeg.a
 CPPFLAGS=-I/work/dist/AppDir/include LDFLAGS=-L/work/dist/AppDir/lib'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG LCMS2
LIBOTF LIBXML2 MODULES MPS NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11
XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $EMACSDATA: /tmp/.mount_emacsCDP179/share/emacs/31.0.50/etc
  value of $EMACSDOC: /tmp/.mount_emacsCDP179/share/emacs/31.0.50/etc
  value of $EMACSLOADPATH: /tmp/.mount_emacsCDP179/share/emacs/31.0.50/lisp
  value of $EMACSPATH:
/tmp/.mount_emacsCDP179/libexec/emacs/31.0.50/x86_64-pc-linux-gnu
  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=fcitx
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  evil-vimish-fold-mode: t
  vimish-fold-mode: t
  diff-hl-mode: t
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  flycheck-mode: t
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  minibuffer-regexp-mode: t
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  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/home/yikai/.emacs.d/lib/which-key/which-key hides
/tmp/.mount_emacsCDP179/share/emacs/31.0.50/lisp/which-key
/home/yikai/.emacs.d/lib/transient/lisp/transient hides
/tmp/.mount_emacsCDP179/share/emacs/31.0.50/lisp/transient
/home/yikai/.emacs.d/lib/editorconfig/editorconfig hides
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/home/yikai/.emacs.d/lib/editorconfig/editorconfig-tools hides
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/home/yikai/.emacs.d/lib/editorconfig/editorconfig-core hides
/tmp/.mount_emacsCDP179/share/emacs/31.0.50/lisp/editorconfig-core
/home/yikai/.emacs.d/lib/editorconfig/editorconfig-core-handle hides
/tmp/.mount_emacsCDP179/share/emacs/31.0.50/lisp/editorconfig-core-handle
/home/yikai/.emacs.d/lib/editorconfig/editorconfig-conf-mode hides
/tmp/.mount_emacsCDP179/share/emacs/31.0.50/lisp/editorconfig-conf-mode
/home/yikai/.emacs.d/lib/compat/compat hides
/tmp/.mount_emacsCDP179/share/emacs/31.0.50/lisp/emacs-lisp/compat

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 (intervals 64 0 0) (buffers 1000 0))

bug#74590: 31.0.50 [scratch/igc branch]; key input sometimes skip fcitx input method preedit box

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

On Thursday, November 28th, 2024 at 13:18, Yikai Zhao <yikai@z1k.dev> wrote:
> I encountered this bug while testing the mps (scratch/igc) branch. I
> cannot reproduce this with the current master branch.

Can you reproduce it on the scratch/igc branch, but compiled without mps support?

That might help us narow it down to the MPS code or some unrelated change on that branch.

Pip

bug#74590: 31.0.50 [scratch/igc branch]; key input sometimes skip fcitx input method preedit box

[Yikai Zhao]

I can confirm that the issue does not happen on the scratch/igc branch
without mps support
(or at least much less frequent)

On Thu, Nov 28, 2024 at 9:33 PM Pip Cet <pipcet@protonmail.com> wrote:
>
> On Thursday, November 28th, 2024 at 13:18, Yikai Zhao <yikai@z1k.dev> wrote:
> > I encountered this bug while testing the mps (scratch/igc) branch. I
> > cannot reproduce this with the current master branch.
>
> Can you reproduce it on the scratch/igc branch, but compiled without mps support?
>
> That might help us narow it down to the MPS code or some unrelated change on that branch.
>
> Pip

bug#74590: 31.0.50 [scratch/igc branch]; key input sometimes skip fcitx input method preedit box

[Gerd Möllmann]

Yikai Zhao <yikai@z1k.dev> writes:

> I can confirm that the issue does not happen on the scratch/igc branch
> without mps support
> (or at least much less frequent)
>
> On Thu, Nov 28, 2024 at 9:33 PM Pip Cet <pipcet@protonmail.com> wrote:
>>
>> On Thursday, November 28th, 2024 at 13:18, Yikai Zhao <yikai@z1k.dev> wrote:
>> > I encountered this bug while testing the mps (scratch/igc) branch. I
>> > cannot reproduce this with the current master branch.
>>
>> Can you reproduce it on the scratch/igc branch, but compiled without mps support?
>>
>> That might help us narow it down to the MPS code or some unrelated change on that branch.
>>
>> Pip

Not sure if that is used in your build, but in x_display_info (xterm.h)
I see a number of struct frame pointers that are not fixed in fix_frame,
starting with

  struct frame *x_focus_frame;

And if it's not that display info that is being used, I'd bet a small
amount that whatever is actually used (pgtk_display_info?) has a similar
problems.

(Can't fix this myself, sorry, I only have macOS.)

bug#74590: 31.0.50 [scratch/igc branch]; key input sometimes skip fcitx input method preedit box

[Gerd Möllmann]

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

Wanted to get Helmut onboard, in case he's interested, but forgot to add
him in CC. Now he is.

> Yikai Zhao <yikai@z1k.dev> writes:
>
>> I can confirm that the issue does not happen on the scratch/igc branch
>> without mps support
>> (or at least much less frequent)
>>
>> On Thu, Nov 28, 2024 at 9:33 PM Pip Cet <pipcet@protonmail.com> wrote:
>>>
>>> On Thursday, November 28th, 2024 at 13:18, Yikai Zhao <yikai@z1k.dev> wrote:
>>> > I encountered this bug while testing the mps (scratch/igc) branch. I
>>> > cannot reproduce this with the current master branch.
>>>
>>> Can you reproduce it on the scratch/igc branch, but compiled without mps support?
>>>
>>> That might help us narow it down to the MPS code or some unrelated change on that branch.
>>>
>>> Pip
>
> Not sure if that is used in your build, but in x_display_info (xterm.h)
> I see a number of struct frame pointers that are not fixed in fix_frame,
> starting with
>
>   struct frame *x_focus_frame;
>
> And if it's not that display info that is being used, I'd bet a small
> amount that whatever is actually used (pgtk_display_info?) has a similar
> problems.
>
> (Can't fix this myself, sorry, I only have macOS.)