bug#49555: 28.0.50; height display property causes text to render with incorrect spacing

bug#49555: 28.0.50; height display property causes text to render with incorrect spacing

[Adam Edge]

Hello,

I have encountered this bug while using lsp-ui mode. When a text is
propertized with the display property `height', it is then displayed
with the incorrect spacing. To test it, I have used this code:

(require 'lsp-ui)
(let* ((text "Hello world")
      (propertized (progn (add-face-text-property 0 (length text)
'lsp-ui-sideline-code-action nil text)
                          text))
      (overlay (make-overlay 1 1)))
  (overlay-put overlay 'after-string (concat propertized
                                        (propertize propertized 'display
(lsp-ui-sideline--compute-height)))))

lsp-ui-sideline-code-action can be any face with a font with different
spacing. In my Emacs configuration, it is defined as:

(font-spec :family "Fira Code" :size 14 :weight 'regular :spacing 100)

When the two "Hello world"s are displayed next to each other, the one
which is propertized with the "height" property displays wider. In
lsp-ui's case, this causes text to be cut off by the right side of the
Emacs frame as it overflows (since the code actions are displayed as an
overlay on the right side of the frame).

I can share images of what I see if there is an image hosting website
you'd like me to share it on.

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.29, cairo version 1.16.0)
 of 2021-06-13 built on localhost
Repository revision: dc471feee3bcac872cc52cdc73282955cd2d219d
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Gentoo/Linux

Configured using:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --disable-silent-rules
 --docdir=/usr/share/doc/emacs-28.0.9999
 --htmldir=/usr/share/doc/emacs-28.0.9999/html --libdir=/usr/lib64
 --program-suffix=-emacs-28-vcs --includedir=/usr/include/emacs-28-vcs
 --infodir=/usr/share/info/emacs-28-vcs --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --without-compress-install --without-hesiod --without-pop
 --with-file-notification=inotify --with-pdumper --enable-acl
 --with-dbus --without-modules --without-gameuser --with-libgmp
 --with-gpm --with-native-compilation --without-json --without-kerberos
 --without-kerberos5 --with-lcms2 --with-xml2 --without-mailutils
 --without-selinux --with-gnutls --without-libsystemd --with-threads
 --with-wide-int --with-zlib --with-sound=alsa --with-x --without-ns
 --without-gconf --without-gsettings --without-toolkit-scroll-bars
 --with-gif --with-jpeg --with-png --with-rsvg --with-tiff --with-xpm
 --without-imagemagick --with-xft --with-cairo --without-harfbuzz
 --without-libotf --without-m17n-flt --with-x-toolkit=gtk3
 --without-xwidgets --with-dumping=pdumper 'CFLAGS=-O2 -pipe
 -march=native -mtune=native' CPPFLAGS= 'LDFLAGS=-Wl,-O1
 -Wl,--as-needed''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM JPEG LCMS2 LIBXML2
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $LC_CTYPE: en_US.utf8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: RJSX

Minor modes in effect:
  evil-traces-mode: t
  global-anzu-mode: t
  anzu-mode: t
  lsp-diagnostics-mode: t
  lsp-modeline-workspace-status-mode: t
  lsp-modeline-diagnostics-mode: t
  lsp-modeline-code-actions-mode: t
  lsp-ui-mode: t
  lsp-ui-sideline-mode: t
  lsp-completion-mode: t
  git-gutter-mode: t
  tide-hl-identifier-mode: t
  tide-mode: t
  emmet-mode: t
  js2-refactor-mode: t
  npm-mode: t
  cursor-sensor-mode: t
  whitespace-mode: t
  flycheck-popup-tip-mode: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  eros-mode: t
  rainbow-delimiters-mode: t
  display-fill-column-indicator-mode: t
  vi-tilde-fringe-mode: t
  highlight-numbers-mode: t
  display-line-numbers-mode: t
  hl-todo-mode: t
  highlight-indent-guides-mode: t
  recentf-mode: t
  save-place-mode: t
  global-so-long-mode: t
  global-git-commit-mode: t
  gcmh-mode: t
  global-hl-line-mode: t
  hl-line-mode: t
  winner-mode: t
  show-paren-mode: t
  ws-butler-global-mode: t
  ws-butler-mode: t
  global-undo-fu-session-mode: t
  undo-fu-session-mode: t
  undo-fu-mode: t
  which-key-mode: t
  savehist-mode: t
  better-jumper-mode: t
  better-jumper-local-mode: t
  global-company-mode: t
  company-mode: t
  evil-goggles-mode: t
  evil-escape-mode: t
  evil-snipe-override-mode: t
  evil-snipe-mode: t
  evil-snipe-override-local-mode: t
  evil-snipe-local-mode: t
  format-all-mode: t
  xterm-mouse-mode: t
  xclip-mode: t
  solaire-global-mode: t
  doom-modeline-mode: t
  projectile-mode: t
  lsp-managed-mode: t
  lsp-mode: t
  dtrt-indent-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  ivy-rich-project-root-cache-mode: t
  ivy-rich-mode: t
  ivy-mode: t
  smartparens-global-mode: t
  smartparens-mode: t
  persp-mode: t
  global-flycheck-mode: t
  flycheck-mode: t
  +web-react-mode: t
  +javascript-npm-mode: t
  +lsp-optimization-mode: t
  shell-dirtrack-mode: t
  evil-mode: t
  evil-local-mode: t
  windmove-mode: t
  +popup-mode: t
  general-override-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
  window-divider-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

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bug#49555: 28.0.50; height display property causes text to render with incorrect spacing

[Eli Zaretskii]

> From: Adam Edge <baronedge@airmail.cc>
> Date: Wed, 14 Jul 2021 01:27:22 +0300
> 
> I have encountered this bug while using lsp-ui mode. When a text is
> propertized with the display property `height', it is then displayed
> with the incorrect spacing. To test it, I have used this code:
> 
> (require 'lsp-ui)
> (let* ((text "Hello world")
>       (propertized (progn (add-face-text-property 0 (length text)
> 'lsp-ui-sideline-code-action nil text)
>                           text))
>       (overlay (make-overlay 1 1)))
>   (overlay-put overlay 'after-string (concat propertized
>                                         (propertize propertized 'display
> (lsp-ui-sideline--compute-height)))))
> 
> lsp-ui-sideline-code-action can be any face with a font with different
> spacing. In my Emacs configuration, it is defined as:
> 
> (font-spec :family "Fira Code" :size 14 :weight 'regular :spacing 100)
> 
> When the two "Hello world"s are displayed next to each other, the one
> which is propertized with the "height" property displays wider. In
> lsp-ui's case, this causes text to be cut off by the right side of the
> Emacs frame as it overflows (since the code actions are displayed as an
> overlay on the right side of the frame).

I'm a bit confused by the scenario description.  Could you perhaps
provide a simple self-contained recipe, which would not need any
third-party packages like lsp-ui, and could be invoked from "emacs -Q"?
It sounds like any references to lsp-ui in your scenario are not
really relevant, and just muddy the waters?

And what do you mean by "a font with a different spacing"? what is the
spacing of the default font in your case? and what is the default font
itself?

Thanks.

bug#49555: 28.0.50; height display property causes text to render with incorrect spacing

[Adam Edge]

On 7/14/21 3:55 PM, Eli Zaretskii wrote:
>> From: Adam Edge <baronedge@airmail.cc>
>> Date: Wed, 14 Jul 2021 01:27:22 +0300
>>
>> I have encountered this bug while using lsp-ui mode. When a text is
>> propertized with the display property `height', it is then displayed
>> with the incorrect spacing. To test it, I have used this code:
>>
>> (require 'lsp-ui)
>> (let* ((text "Hello world")
>>       (propertized (progn (add-face-text-property 0 (length text)
>> 'lsp-ui-sideline-code-action nil text)
>>                           text))
>>       (overlay (make-overlay 1 1)))
>>   (overlay-put overlay 'after-string (concat propertized
>>                                         (propertize propertized 'display
>> (lsp-ui-sideline--compute-height)))))
>>
>> lsp-ui-sideline-code-action can be any face with a font with different
>> spacing. In my Emacs configuration, it is defined as:
>>
>> (font-spec :family "Fira Code" :size 14 :weight 'regular :spacing 100)
>>
>> When the two "Hello world"s are displayed next to each other, the one
>> which is propertized with the "height" property displays wider. In
>> lsp-ui's case, this causes text to be cut off by the right side of the
>> Emacs frame as it overflows (since the code actions are displayed as an
>> overlay on the right side of the frame).
> I'm a bit confused by the scenario description.  Could you perhaps
> provide a simple self-contained recipe, which would not need any
> third-party packages like lsp-ui, and could be invoked from "emacs -Q"?
> It sounds like any references to lsp-ui in your scenario are not
> really relevant, and just muddy the waters?
>
> And what do you mean by "a font with a different spacing"? what is the
> spacing of the default font in your case? and what is the default font
> itself?
>
> Thanks.
>
>
>

Thanks for your response. I am trying to come up with something that works
on emacs -Q. This is what I've come up with:

(setq my-font (font-spec :family "Fira Code" :size 14 :weight 'regular :spacing 100))
(set-frame-font my-font)
(set-face-attribute 'default t :font my-font)

(defface test-face '((t :inherit default))
  "A face for testing.")
(let* ((text "Hello world")
       (propertized (progn (add-face-text-property 0 (length text) 'test-face nil text)
			   text))
       (overlay (make-overlay 1 1)))
  (overlay-put overlay 'after-string (concat propertized "\n"
					     (propertize propertized 'display '(height 1)))))

Running this in the scratch buffer in emacs -Q produces two "Hello world"s,
the latter having more space between each letter and being slightly bolder
(which is not what I want).

Another thing I've noticed is that when I just did the (set-face-attribute)
part without (set-frame-font) and opened a new frame, the frame's font was
the same as the one with incorrect letter spacing. When I did
M-x describe-font RET, this is what I got in the `full name' line:Fira
Code:pixelsize=14:foundry=CTDB:weight=normal:slant=normal:width=normal:spacing=90:scalable=true
And the font loaded is: /usr/share/fonts/fira-code/FiraCode-Medium.ttf
After doing the (set-frame-font), the font returned to the desired
spacing. The `full-name' line in describe-font now is: Fira
Code:pixelsize=14:foundry=CTDB:weight=normal:slant=normal:width=normal:spacing=100:scalable=true
And the font loaded now is:
/home/aedge/.local/share/fonts/FiraCode-Retina.ttf I suppose removing
the system font should fix my problem here, and the issue can be closed,
but why does the font change when '(height 1) is specified?

bug#49555: 28.0.50; height display property causes text to render with incorrect spacing

[Adam Edge]

On 7/14/21 7:00 PM, Adam Edge wrote:
> On 7/14/21 3:55 PM, Eli Zaretskii wrote:
>>> From: Adam Edge <baronedge@airmail.cc>
>>> Date: Wed, 14 Jul 2021 01:27:22 +0300
>>>
>>> I have encountered this bug while using lsp-ui mode. When a text is
>>> propertized with the display property `height', it is then displayed
>>> with the incorrect spacing. To test it, I have used this code:
>>>
>>> (require 'lsp-ui)
>>> (let* ((text "Hello world")
>>>       (propertized (progn (add-face-text-property 0 (length text)
>>> 'lsp-ui-sideline-code-action nil text)
>>>                           text))
>>>       (overlay (make-overlay 1 1)))
>>>   (overlay-put overlay 'after-string (concat propertized
>>>                                         (propertize propertized 'display
>>> (lsp-ui-sideline--compute-height)))))
>>>
>>> lsp-ui-sideline-code-action can be any face with a font with different
>>> spacing. In my Emacs configuration, it is defined as:
>>>
>>> (font-spec :family "Fira Code" :size 14 :weight 'regular :spacing 100)
>>>
>>> When the two "Hello world"s are displayed next to each other, the one
>>> which is propertized with the "height" property displays wider. In
>>> lsp-ui's case, this causes text to be cut off by the right side of the
>>> Emacs frame as it overflows (since the code actions are displayed as an
>>> overlay on the right side of the frame).
>> I'm a bit confused by the scenario description.  Could you perhaps
>> provide a simple self-contained recipe, which would not need any
>> third-party packages like lsp-ui, and could be invoked from "emacs -Q"?
>> It sounds like any references to lsp-ui in your scenario are not
>> really relevant, and just muddy the waters?
>>
>> And what do you mean by "a font with a different spacing"? what is the
>> spacing of the default font in your case? and what is the default font
>> itself?
>>
>> Thanks.
>>
>>
>>
> Thanks for your response. I am trying to come up with something that works
> on emacs -Q. This is what I've come up with:
>
> (setq my-font (font-spec :family "Fira Code" :size 14 :weight 'regular :spacing 100))
> (set-frame-font my-font)
> (set-face-attribute 'default t :font my-font)
>
> (defface test-face '((t :inherit default))
>   "A face for testing.")
> (let* ((text "Hello world")
>        (propertized (progn (add-face-text-property 0 (length text) 'test-face nil text)
> 			   text))
>        (overlay (make-overlay 1 1)))
>   (overlay-put overlay 'after-string (concat propertized "\n"
> 					     (propertize propertized 'display '(height 1)))))
>
> Running this in the scratch buffer in emacs -Q produces two "Hello world"s,
> the latter having more space between each letter and being slightly bolder
> (which is not what I want).
>
> Another thing I've noticed is that when I just did the (set-face-attribute)
> part without (set-frame-font) and opened a new frame, the frame's font was
> the same as the one with incorrect letter spacing. When I did
> M-x describe-font RET, this is what I got in the `full name' line:Fira
> Code:pixelsize=14:foundry=CTDB:weight=normal:slant=normal:width=normal:spacing=90:scalable=true
> And the font loaded is: /usr/share/fonts/fira-code/FiraCode-Medium.ttf
> After doing the (set-frame-font), the font returned to the desired
> spacing. The `full-name' line in describe-font now is: Fira
> Code:pixelsize=14:foundry=CTDB:weight=normal:slant=normal:width=normal:spacing=100:scalable=true
> And the font loaded now is:
> /home/aedge/.local/share/fonts/FiraCode-Retina.ttf I suppose removing
> the system font should fix my problem here, and the issue can be closed,
> but why does the font change when '(height 1) is specified?
>

I am sorry, for some reason the lines in my previous email got messed up, so
I am reproducing them below;

When I did M-x describe-font RET, this is what I got in the `full name'
line:

Fira
Code:pixelsize=14:foundry=CTDB:weight=normal:slant=normal:width=normal:spacing=90:scalable=true
And the font file loaded was: /usr/share/fonts/fira-code/FiraCode-Medium.ttf

After doing the (set-frame-font), the font returned to the desired
spacing. The `full-name' line in describe-font now is:

Fira
Code:pixelsize=14:foundry=CTDB:weight=normal:slant=normal:width=normal:spacing=100:scalable=true
And the font loaded now is:
/home/aedge/.local/share/fonts/FiraCode-Retina.ttf

I suppose removing the system font should fix my problem here, and the
issue can be closed, but why does the font change when '(height 1) is
specified?

bug#49555: 28.0.50; height display property causes text to render with incorrect spacing

[Eli Zaretskii]

> From: Adam Edge <baronedge@airmail.cc>
> Date: Wed, 14 Jul 2021 19:00:25 +0300
> 
> Another thing I've noticed is that when I just did the (set-face-attribute)
> part without (set-frame-font) and opened a new frame, the frame's font was
> the same as the one with incorrect letter spacing. When I did
> M-x describe-font RET, this is what I got in the `full name' line:Fira
> Code:pixelsize=14:foundry=CTDB:weight=normal:slant=normal:width=normal:spacing=90:scalable=true
> And the font loaded is: /usr/share/fonts/fira-code/FiraCode-Medium.ttf
> After doing the (set-frame-font), the font returned to the desired
> spacing. The `full-name' line in describe-font now is: Fira
> Code:pixelsize=14:foundry=CTDB:weight=normal:slant=normal:width=normal:spacing=100:scalable=true
> And the font loaded now is:
> /home/aedge/.local/share/fonts/FiraCode-Retina.ttf I suppose removing
> the system font should fix my problem here, and the issue can be closed,
> but why does the font change when '(height 1) is specified?

Good question.  I don't really know the answer, but maybe that's
because the original font has a slightly different height?

bug#49555: 28.0.50; height display property causes text to render with incorrect spacing

[Eli Zaretskii]

> Date: Sat, 17 Jul 2021 15:05:19 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 49555@debbugs.gnu.org
> 
> Good question.  I don't really know the answer, but maybe that's
> because the original font has a slightly different height?

Sorry, I meant "spacing", not "height".