bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

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

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Hi, the commit 84bf9549860aae22931951d52b194b1fcfca1556 (Use a
proportional font for the mode line) added the min-width property to
mode-line-client.  If emacs is in server-mode a space between mule info
and "@" is added:


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I've made a patch where I moved a couple of line out of the list
function but I'm not sure if you can merge it because my uni hasn't
finished reviewing the copyright papers.

My previous contribution is 63cbb54d7e163f74657dba46829262282ccda0df .


In GNU Emacs 29.0.50 (build 26, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.17.4)
 of 2021-11-28 built on T480s
Repository revision: 08d1c405073f614d89bcdf7f6bd19e8c8aaf8356
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-sound=alsa --with-modules --without-gconf --without-gsettings
 --with-pgtk --with-xinput2 --with-native-compilation
 --with-x-toolkit=gtk3 --without-xaw3d --without-compress-install
 '--program-transform-name=s/\([ec]tags\)/\1.emacs/'
 'CFLAGS=-march=native -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection -flto'
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now
 'CXXFLAGS=-march=native -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection -Wp,-D_GLIBCXX_ASSERTIONS
 -flto''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM HARFBUZZ JPEG JSON LCMS2
LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11
XDBE XIM XINPUT2 XPM GTK3 ZLIB

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

Major mode: Helpful

Minor modes in effect:
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  global-tree-sitter-mode: t
  electric-pair-mode: t
  flycheck-pos-tip-mode: t
  global-flycheck-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  global-diff-hl-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  which-key-mode: t
  global-auto-revert-mode: t
  winner-mode: t
  repeat-mode: t
  save-place-mode: t
  corfu-global-mode: t
  corfu-mode: t
  marginalia-mode: t
  savehist-mode: t
  vertico-mouse-mode: t
  vertico-mode: t
  minibuffer-depth-indicate-mode: t
  global-so-long-mode: t
  override-global-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
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/home/davide/.emacs.d/straight/build/org/ob-comint hides /usr/share/emacs/29.0.50/lisp/org/ob-comint
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/home/davide/.emacs.d/straight/build/org/org-mobile hides /usr/share/emacs/29.0.50/lisp/org/org-mobile
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/home/davide/.emacs.d/straight/build/org/ob-emacs-lisp hides /usr/share/emacs/29.0.50/lisp/org/ob-emacs-lisp
/home/davide/.emacs.d/straight/build/org/ob-clojure hides /usr/share/emacs/29.0.50/lisp/org/ob-clojure
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Features:
(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 coolj notmuch-query icalendar diary-lib diary-loaddefs
cal-menu calendar cal-loaddefs notmuch-tag notmuch-lib notmuch-version
notmuch-compat hl-line mm-view mml-smime smime dig shadow sort mail-extr
emacsbug sendmail whitespace cus-start cus-load quail tramp-cmds ibuffer
ibuffer-loaddefs project vc-mtn vc-hg vc-bzr vc-src vc-sccs vc-svn
vc-cvs vc-rcs goto-addr mule-util jka-compr helpful trace edebug
backtrace info-look f help-fns radix-tree elisp-refs s misearch
multi-isearch face-remap forge-list forge-commands forge-semi
forge-bitbucket buck forge-gogs gogs forge-gitea gtea forge-gitlab glab
forge-github ghub-graphql treepy gsexp ghub let-alist gnutls
forge-notify forge-revnote forge-pullreq forge-issue forge-topic yaml
forge-post markdown-mode noutline outline forge-repo forge forge-core
forge-db closql emacsql-sqlite emacsql emacsql-compiler url-http
url-auth url-gw nsm magit-extras magit-bookmark magit-submodule
magit-obsolete magit-blame magit-stash magit-reflog magit-bisect
magit-push magit-pull magit-fetch magit-clone magit-remote magit-commit
magit-sequence magit-notes magit-worktree magit-tag magit-merge
magit-branch magit-reset magit-files magit-refs magit-status magit
package browse-url url-handlers magit-repos magit-apply magit-wip
magit-log which-func imenu magit-diff smerge-mode diff git-commit
log-edit message yank-media rmc puny rfc822 mml mml-sec epa epg rfc6068
epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
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mailabbrev mail-utils gmm-utils mailheader add-log magit-core
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utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
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dbusbind inotify lcms2 dynamic-setting font-render-setting cairo
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
native-compile emacs)

Memory information:
((conses 16 833764 71559)
 (symbols 48 38352 55)
 (strings 32 168815 9931)
 (string-bytes 1 6526011)
 (vectors 16 100299)
 (vector-slots 8 2230163 147527)
 (floats 8 523 1010)
 (intervals 56 49150 1928)
 (buffers 992 37))

-- 
Davide Masserut

bug#52183: (29.0.50; Empty space in the mode line if server-mode is active)

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

Here is the message that I thought I had sent to emacs-devel (I pressed
the button "Reply to" and at the time I was not subscribed):


> Seems like the "@" thingy on client frames' mode-line causes the
> preceding mode-line-mule-info to be padded to 5-char width, for some
> reason.

I think the issue is here [1].
Moving mode-line-mule-info and mode-line-client
before  "(list :propertize ..." seems to fix the problem.

[1]:
http://git.savannah.gnu.org/gitweb/?p=emacs.git;a=blob;f=lisp/bindings.el;h=e28b06a1dcd924551d74ad9ee02b831d8577c460;hb=refs/heads/master#l610


BTW, does emacs-devel block email from people who are not subscribed to
the list?

-- 
Davide Masserut

bug#52183: (29.0.50; Empty space in the mode line if server-mode is active)

[Eli Zaretskii]

> Date: Tue, 30 Nov 2021 09:57:51 +0100
> From:  Davide Masserut via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Here is the message that I thought I had sent to emacs-devel (I pressed
> the button "Reply to" and at the time I was not subscribed):
> 
> 
> > Seems like the "@" thingy on client frames' mode-line causes the
> > preceding mode-line-mule-info to be padded to 5-char width, for some
> > reason.
> 
> I think the issue is here [1].
> Moving mode-line-mule-info and mode-line-client
> before  "(list :propertize ..." seems to fix the problem.

But that would defeat the purpose of that propertize, I think?  So it
isn't the right solution.  And we need to understand the root cause of
this anyway, before we devise a solution.  If you did understand it,
please describe the details.

> BTW, does emacs-devel block email from people who are not subscribed to
> the list?

No.  Why do you ask?

bug#52183: (29.0.50; Empty space in the mode line if server-mode is active)

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

Eli Zaretskii <eliz@gnu.org> writes:

> But that would defeat the purpose of that propertize, I think?  So it
> isn't the right solution.  And we need to understand the root cause of
> this anyway, before we devise a solution.  If you did understand it,
> please describe the details.

Lars mentioned a bug but I wasn't able to find what he was referring to.
Can you point me to the discussion about the alleged bug?

> No.  Why do you ask?

My fault, I didn't see that the precompiled message didn't include
emacs-devel as Cc.

-- 
Davide Masserut

bug#52183: (29.0.50; Empty space in the mode line if server-mode is active)

[Eli Zaretskii]

> From: Davide Masserut <dm@mssdvd.com>
> Cc: 52183@debbugs.gnu.org
> Date: Tue, 30 Nov 2021 18:52:45 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > But that would defeat the purpose of that propertize, I think?  So it
> > isn't the right solution.  And we need to understand the root cause of
> > this anyway, before we devise a solution.  If you did understand it,
> > please describe the details.
> 
> Lars mentioned a bug but I wasn't able to find what he was referring to.
> Can you point me to the discussion about the alleged bug?

Lars meant the problem with putting the min-width display spec on
strings like %p, which generate C strings in the display code, and
therefore cannot affect their display by using the 'display' property.

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

[Eli Zaretskii]

> Date: Mon, 29 Nov 2021 16:59:40 +0100
> From:  Davide Masserut via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Hi, the commit 84bf9549860aae22931951d52b194b1fcfca1556 (Use a
> proportional font for the mode line) added the min-width property to
> mode-line-client.  If emacs is in server-mode a space between mule info
> and "@" is added:

Do you still see this on the current master?  I seem to be unable to
reproduce this today.

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

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

Eli Zaretskii <eliz@gnu.org> writes:

> Do you still see this on the current master?  I seem to be unable to
> reproduce this today.

I'm still seeing it on "3e7aff5fcdd3fa6e30497323c914f6c79c951ed6".

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

[Eli Zaretskii]

> From: Davide Masserut <dm@mssdvd.com>
> Cc: 52183@debbugs.gnu.org
> Date: Sat, 04 Dec 2021 10:56:17 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Do you still see this on the current master?  I seem to be unable to
> > reproduce this today.
> 
> I'm still seeing it on "3e7aff5fcdd3fa6e30497323c914f6c79c951ed6".

Ignore me: I wasn't testing this properly.

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

[Eli Zaretskii]

> Date: Sat, 04 Dec 2021 12:29:28 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 52183@debbugs.gnu.org
> 
> > From: Davide Masserut <dm@mssdvd.com>
> > Cc: 52183@debbugs.gnu.org
> > Date: Sat, 04 Dec 2021 10:56:17 +0100
> > 
> > Eli Zaretskii <eliz@gnu.org> writes:
> > 
> > > Do you still see this on the current master?  I seem to be unable to
> > > reproduce this today.
> > 
> > I'm still seeing it on "3e7aff5fcdd3fa6e30497323c914f6c79c951ed6".
> 
> Ignore me: I wasn't testing this properly.

I think I understand the root cause of this.

bindings.el produce this part of mode line as follows:

             (list
              :propertize
              (list ""
	            'mode-line-mule-info
	            'mode-line-client
	            'mode-line-modified
	            'mode-line-remote)
              'display '(min-width (5.0)))

This presumes that the values of the mode-line-* variables mentioned
there will be concatenated, then the display property with the
min-width spec added to the result of the concatenation, and then the
result will be displayed.

But that's not how the mode-line display works.  The "concatenation",
as mentioned in the ELisp manual:

  ‘(STRING REST...)’
  ‘(LIST REST...)’
       A list whose first element is a string or list means to process all
       the elements recursively and concatenate the results.

is not a real concatenation that produces a Lisp string, it is a
"effective concatenation" that happens on display, because the
elements of the list are displayed one after the other.  Any string in
the list gets the properties specified in :propertize applied to it
_before_ displaying it, but text properties on C strings are ignored
when they are displayed, and so have no effect.

Now the way min-width is implemented, if we display a series of C
strings, then display a Lisp string, the min-width will have effect
before the Lisp string is displayed.  Which is what happens here: the
"@" indicator is computed in bindings.el as a Lisp string.  Without
the "@" part, the "  " string that follows the above group of
indicators plays the role of that Lisp string, so the min-width thing
_seems_ to work as intended when all the 4 parts above are either C
strings or empty strings.

Bottom line: I think to make this work as intended, bindings.el should
be modified to produce a Lisp string from all those 4 elements, by
concatenating them, and then the min-width display spec should be put
on the result of the concatenation.

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Bottom line: I think to make this work as intended, bindings.el should
> be modified to produce a Lisp string from all those 4 elements, by
> concatenating them, and then the min-width display spec should be put
> on the result of the concatenation.

I thought we were going to fix min-width so that that machinery was also
called on the C strings (that are going to end up having the text
property added afterwards)?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: dm@mssdvd.com,  52183@debbugs.gnu.org
> Date: Sat, 04 Dec 2021 20:04:52 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Bottom line: I think to make this work as intended, bindings.el should
> > be modified to produce a Lisp string from all those 4 elements, by
> > concatenating them, and then the min-width display spec should be put
> > on the result of the concatenation.
> 
> I thought we were going to fix min-width so that that machinery was also
> called on the C strings (that are going to end up having the text
> property added afterwards)?

I still plan on doing that, but I don't see how it would help here.
AFAIU, it will make the result worse.

The main point of what I wrote is that we actually display the whole
5-to-6 character sequence of indicators as 4 separate strings, not as
a single string made of concatenation of those 4.  So even if/when the
min-width stuff is fixed as we discussed, you will have 4 strings
displayed one after the other, and each one of them has the min-width
spec, so each one of them will be displayed as at least 5 characters.
And that's not what you want here.

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> The main point of what I wrote is that we actually display the whole
> 5-to-6 character sequence of indicators as 4 separate strings, not as
> a single string made of concatenation of those 4.  So even if/when the
> min-width stuff is fixed as we discussed, you will have 4 strings
> displayed one after the other, and each one of them has the min-width
> spec, so each one of them will be displayed as at least 5 characters.
> And that's not what you want here.

It sounds like much the same thing that happens when doing the
" (%l,%c)" -- you also get two strings then, which is why the min-width
end handler checks that we're really at the end of the sequence of strings.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: dm@mssdvd.com,  52183@debbugs.gnu.org
> Date: Sat, 04 Dec 2021 23:01:33 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > The main point of what I wrote is that we actually display the whole
> > 5-to-6 character sequence of indicators as 4 separate strings, not as
> > a single string made of concatenation of those 4.  So even if/when the
> > min-width stuff is fixed as we discussed, you will have 4 strings
> > displayed one after the other, and each one of them has the min-width
> > spec, so each one of them will be displayed as at least 5 characters.
> > And that's not what you want here.
> 
> It sounds like much the same thing that happens when doing the
> " (%l,%c)" -- you also get two strings then, which is why the min-width
> end handler checks that we're really at the end of the sequence of strings.

That's sheer luck, an artifact of the particular implementation in
display_min_width.  Specifically, the stretch glyph is appended when
we see a new Lisp string, so the " " separator after those elements
plays that role.  That's why we get that extra space before "@" in the
situation described by this bug report: that "@" is the first Lisp
string that follows mode-line-mule-info, and mode-line-mule-info is
produced as C strings.

So another way to fix this is to introduce a new mode-line construct,
say %=, which will produce either an empty string or "@" for client
frames, as C strings, and use that as mode-line-client element.  Then
all of those 4 elements will be produced as C strings, and the problem
reported in this bug report will be solved.  But then the change we
discussed that would allow processing such properties on C strings
will again break this, because it will apply min-width to each
separate C string in this group of indicators.

Basically, the way we display the mode line with text properties only
works for properties that have the same effect if applied to each part
of a string separately, or to the entire string in one go.  Faces and
help-echo are like that; but the min-width display spec isn't, because
it takes effect when the string _ends_, so where the string ends and
how many strings are there is important for it.  Thus, concatenating
the strings before propertizing is really needed for this to work on a
group of strings.

bug#52183: 29.0.50; Empty space in the mode line if server-mode is active

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> That's sheer luck, an artifact of the particular implementation in
> display_min_width.  Specifically, the stretch glyph is appended when
> we see a new Lisp string, so the " " separator after those elements
> plays that role.  That's why we get that extra space before "@" in the
> situation described by this bug report: that "@" is the first Lisp
> string that follows mode-line-mule-info, and mode-line-mule-info is
> produced as C strings.

Hm...  I see...  I think.  I though I had that covered, but I haven't
tried to re-debug the code after we started discussing this.

> Thus, concatenating the strings before propertizing is really needed
> for this to work on a group of strings.

It's possible, but I thought I was seeing something else.  I'll try to
do some more poking at the code.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#52183: Acknowledgement (29.0.50; Empty space in the mode line if server-mode is active)

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

Hi, this bug report can be merged with 62846 and 58183.

bug#52183: Acknowledgement (29.0.50; Empty space in the mode line if server-mode is active)

[Eli Zaretskii]

close 52183
merge 52183 58183
thanks

> Date: Fri, 28 Jul 2023 16:43:33 +0200
> From:  Davide Masserut via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Hi, this bug report can be merged with 62846 and 58183.

Thanks, done.