GNU bug report logs - #27872
[macOS] (without Symbola) freeze when opening file with emojis

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

From: Nejc Vivod <nvivod <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 00:44:24 +0200

[Message part 1 (text/plain, inline)]

Emacs installed via homebrew (--with-cocoa enabled) freezes with 100%
CPU usage when opening a file that contains unicode emojis. Other
editors handle the file just fine (and default mac emacs opens it, but
doesn't display emojis).
Steps to reproduce:
1. emacs -Q
2. open a file that contains a unicode emoji (my test file has a burger icon in it - 🍔)
3. emacs will stop responding and keep the CPU at 100%

Is there a way to at least not display emojis (I’m fine with blocks)? Thank you in advance

In GNU Emacs 26.0.50 (build 2, x86_64-apple-darwin16.7.0, NS appkit-1504.83 Version 10.12.6 (Build 16G29))
of 2017-07-30 built on helghan
Repository revision: 2c930d15f541761422a268cd2b5a7f5c11c9a00e
Windowing system distributor 'Apple', version 10.3.1504
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...

Configured using:
'configure --disable-dependency-tracking --disable-silent-rules
--enable-locallisppath=/usr/local/share/emacs/site-lisp
--infodir=/usr/local/Cellar/emacs/HEAD-2c930d1/share/info/emacs
--prefix=/usr/local/Cellar/emacs/HEAD-2c930d1 --without-x --with-xml2
--without-dbus --without-gnutls --without-imagemagick --with-ns
--disable-ns-self-contained'

Configured features:
JPEG NOTIFY ACL LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS

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

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message subr-x puny seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils time-date tooltip eldoc
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/ns-win
ns-win ucs-normalize mule-util term/common-win tool-bar dnd fontset
image regexp-opt fringe tabulated-list replace newcomment text-mode
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow
isearch timer select scroll-bar mouse jit-lock font-lock syntax facemenu
font-core term/tty-colors frame cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote kqueue cocoa ns multi-tty
make-network-process emacs)

Memory information:
((conses 16 203872 9206)
(symbols 48 19913 2)
(miscs 40 71 157)
(strings 32 29053 1358)
(string-bytes 1 777729)
(vectors 16 34926)
(vector-slots 8 705954 9076)
(floats 8 48 68)
(intervals 56 232 0)
(buffers 992 13))

[smime.p7s (application/pkcs7-signature, attachment)]

Message #8 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Nejc Vivod <nvivod <at> gmail.com>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 05:41:25 +0300

> From: Nejc Vivod <nvivod <at> gmail.com>
> Date: Sun, 30 Jul 2017 00:44:24 +0200
> 
> Emacs installed via homebrew (--with-cocoa enabled) freezes with 100%
> CPU usage when opening a file that contains unicode emojis. Other
> editors handle the file just fine (and default mac emacs opens it, but
> doesn't display emojis).
> Steps to reproduce:
> 1. emacs -Q
> 2. open a file that contains a unicode emoji (my test file has a burger icon in it - 🍔)
> 3. emacs will stop responding and keep the CPU at 100%
> 
> Is there a way to at least not display emojis (I’m fine with blocks)? Thank you in advance

It doesn't freeze here, so it's something NS specific, I guess.

Message #11 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Nejc Vivod <nvivod <at> gmail.com>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 12:55:13 +0100

On Sun, Jul 30, 2017 at 12:44:24AM +0200, Nejc Vivod wrote:
> Emacs installed via homebrew (--with-cocoa enabled) freezes with 100%
> CPU usage when opening a file that contains unicode emojis. Other
> editors handle the file just fine (and default mac emacs opens it, but
> doesn't display emojis).
> Steps to reproduce:
> 1. emacs -Q
> 2. open a file that contains a unicode emoji (my test file has a burger icon in it - 🍔)
> 3. emacs will stop responding and keep the CPU at 100%

I can’t reproduce this with the master branch. Are you sure it’s just
the presence of the emoji and not something else?

I used this command to create a test file:

    echo "🍔" > /tmp/test.txt

> Is there a way to at least not display emojis (I’m fine with blocks)?

GUI Emacs doesn’t display emojis. It’s possible homebrew have included
a patch to enable them.

Can you test with a build direct from git, or a nightly build from
emacsformacosx.com?
-- 
Alan Third

Message #14 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Nejc Vivod <nvivod <at> gmail.com>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 13:34:16 +0100

On Sun, Jul 30, 2017 at 02:10:38PM +0200, Nejc Vivod wrote:
> Tried downloading from emacsformacosx.com
> <http://emacsformacosx.com/> (both the nightly and the stable
> version), still have the same issue - I’ve also recreated the file
> with your echo command. Not sure why it breaks like this, since the
> preinstalled emacs opens the file just fine.

The preinstalled Emacs is ancient. Version 22 or something. Quite a
lot has changed since then. It also only works in the terminal so the
glyph display code is completely different.

> What I did notice is, it seems to allocate a bunch of memory every
> second or so when opening that test file (looking at activity
> monitor -> Info about the process); before I force-killed it, it was
> taking up 2,39GB of ram and it didn’t seem like it would stop.
> 
> I’m attaching a sample of the process, maybe this can be of help. 

I don’t really understand what that’s telling me. Is it possible for
you to run it under a debugger and send me a backtrace?

You’ll probably have lldb installed already, so all you need to do is
run

    lldb /path/to/emacs
    > run

and once it freezes hit ctrl‐c and

    > bt all

and send me the output.

You are running it in GUI mode, and not in the terminal, right?

-- 
Alan Third

Message #17 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Nejc Vivod <nvivod <at> gmail.com>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 14:04:58 +0100

On Sun, Jul 30, 2017 at 02:42:45PM +0200, Nejc Vivod wrote:
> I’m running in gui mode yes. I’ve ran it from lldb, attaching the backtrace. 

It looks like it’s going into a loop while trying to build a list of
available fonts.

I can’t remember if you said you’d tried this, but please try running
Emacs with the -Q parameter. This bypasses your configuration so we
can be sure it’s not something in there.

-- 
Alan Third

Message #20 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alan Third <alan <at> idiocy.org>
Cc: 27872 <at> debbugs.gnu.org, nvivod <at> gmail.com
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 17:12:24 +0300

> Date: Sun, 30 Jul 2017 12:55:13 +0100
> From: Alan Third <alan <at> idiocy.org>
> Cc: 27872 <at> debbugs.gnu.org
> 
> GUI Emacs doesn’t display emojis.

It definitely does that here, albeit without the colors.

Message #23 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alan Third <alan <at> idiocy.org>
Cc: 27872 <at> debbugs.gnu.org, nvivod <at> gmail.com
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 17:17:37 +0300

> Date: Sun, 30 Jul 2017 14:04:58 +0100
> From: Alan Third <alan <at> idiocy.org>
> Cc: 27872 <at> debbugs.gnu.org
> 
> On Sun, Jul 30, 2017 at 02:42:45PM +0200, Nejc Vivod wrote:
> > I’m running in gui mode yes. I’ve ran it from lldb, attaching the backtrace. 
> 
> It looks like it’s going into a loop while trying to build a list of
> available fonts.

Is it possible to post the backtrace here?

Also, please always use "Reply to all", so that the bug address is
CC'ed, and everyone sees the discussion.

Thanks.

Message #26 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Nejc Vivod <nvivod <at> gmail.com>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 17:27:35 +0300

> From: Nejc Vivod <nvivod <at> gmail.com>
> Date: Sun, 30 Jul 2017 16:19:45 +0200
> Cc: 27872 <at> debbugs.gnu.org
> 
> I thought I did, but I might be mistaken. Re-sending the backtrace.

Thanks.

Alan, I don't think I understand how you reached your conclusion: all
the loops involved in the code shown in the backtrace are fixed-size
loops, so they've got to end at some point.  Am I missing something?

Message #29 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 27872 <at> debbugs.gnu.org, Nejc Vivod <nvivod <at> gmail.com>
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 16:06:05 +0100

On Sun, Jul 30, 2017 at 05:27:35PM +0300, Eli Zaretskii wrote:
> > From: Nejc Vivod <nvivod <at> gmail.com>
> > Date: Sun, 30 Jul 2017 16:19:45 +0200
> > Cc: 27872 <at> debbugs.gnu.org
> > 
> > I thought I did, but I might be mistaken. Re-sending the backtrace.
> 
> Thanks.
> 
> Alan, I don't think I understand how you reached your conclusion: all
> the loops involved in the code shown in the backtrace are fixed-size
> loops, so they've got to end at some point.  Am I missing something?

No, I just saw that the last piece of Emacs code in the backtrace was
macfont_list and figured it was probably something to do with that,
but presumably the loop could be somewhere else.

On macOS there is specific code for displaying colour emojis, but it’s
been disabled. I don’t see any emojis at all, just a blank space the
same size as the colour emoji should be.

I don’t know if Macs come with non‐colour emoji capable fonts by
default, all other Mac apps display the colour ones so I can’t even
see a way to test.

If I call describe-char on the hamburger I get:

             position: 146 of 146 (99%), column: 0
            character: 🍔 (displayed as 🍔) (codepoint 127828, #o371524, #x1f354)
    preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x1F354
               script: symbol
               syntax: w 	which means: word
             category: .:Base
             to input: type "C-x 8 RET 1f354" or "C-x 8 RET HAMBURGER"
          buffer code: #xF0 #x9F #x8D #x94
            file code: #xF0 #x9F #x8D #x94 (encoded by coding system utf-8-unix)
              display: no font available

Character code properties: customize what to show
  name: HAMBURGER
  general-category: So (Symbol, Other)
  decomposition: (127828) ('🍔')

There are text properties here:
  fontified            nil

I don’t know if any of this is relevant.
-- 
Alan Third

Message #32 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alan Third <alan <at> idiocy.org>
Cc: 27872 <at> debbugs.gnu.org, nvivod <at> gmail.com
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 18:29:21 +0300

> Date: Sun, 30 Jul 2017 16:06:05 +0100
> From: Alan Third <alan <at> idiocy.org>
> Cc: Nejc Vivod <nvivod <at> gmail.com>, 27872 <at> debbugs.gnu.org
> 
> No, I just saw that the last piece of Emacs code in the backtrace was
> macfont_list and figured it was probably something to do with that,
> but presumably the loop could be somewhere else.
> 
> On macOS there is specific code for displaying colour emojis, but it’s
> been disabled. I don’t see any emojis at all, just a blank space the
> same size as the colour emoji should be.

So maybe the loop is macOS specific.

It's strange that you see "just a blank space", though, because this:

>               display: no font available

means Emacs should have displayed a box with the hex code.

> I don’t know if Macs come with non‐colour emoji capable fonts by
> default, all other Mac apps display the colour ones so I can’t even
> see a way to test.

Can you try installing Symbola?  That's the font I see being used here
for this character.

Message #35 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Nejc Vivod <nvivod <at> gmail.com>
To: Alan Third <alan <at> idiocy.org>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 14:10:38 +0200

[Message part 1 (text/plain, inline)]

Tried downloading from emacsformacosx.com <http://emacsformacosx.com/> (both the nightly and the stable version), still have the same issue - I’ve also recreated the file with your echo command. Not sure why it breaks like this, since the preinstalled emacs opens the file just fine. 
What I did notice is, it seems to allocate a bunch of memory every second or so when opening that test file (looking at activity monitor -> Info about the process); before I force-killed it, it was taking up 2,39GB of ram and it didn’t seem like it would stop.

I’m attaching a sample of the process, maybe this can be of help. 

Thanks for trying to help!






> On 30 Jul 2017, at 13:55, Alan Third <alan <at> idiocy.org> wrote:
> 
> On Sun, Jul 30, 2017 at 12:44:24AM +0200, Nejc Vivod wrote:
>> Emacs installed via homebrew (--with-cocoa enabled) freezes with 100%
>> CPU usage when opening a file that contains unicode emojis. Other
>> editors handle the file just fine (and default mac emacs opens it, but
>> doesn't display emojis).
>> Steps to reproduce:
>> 1. emacs -Q
>> 2. open a file that contains a unicode emoji (my test file has a burger icon in it - 🍔)
>> 3. emacs will stop responding and keep the CPU at 100%
> 
> I can’t reproduce this with the master branch. Are you sure it’s just
> the presence of the emoji and not something else?
> 
> I used this command to create a test file:
> 
>    echo "🍔" > /tmp/test.txt
> 
>> Is there a way to at least not display emojis (I’m fine with blocks)?
> 
> GUI Emacs doesn’t display emojis. It’s possible homebrew have included
> a patch to enable them.
> 
> Can you test with a build direct from git, or a nightly build from
> emacsformacosx.com?
> -- 
> Alan Third

[Message part 2 (text/html, inline)]

[sample.txt (text/plain, attachment)]

[Message part 4 (text/html, inline)]

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Message #38 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Nejc Vivod <nvivod <at> gmail.com>
To: Alan Third <alan <at> idiocy.org>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 14:42:45 +0200

[Message part 1 (text/plain, inline)]

I’m running in gui mode yes. I’ve ran it from lldb, attaching the backtrace. 

Thank you for taking the time

[backtrace.txt (text/plain, attachment)]

[Message part 3 (text/plain, inline)]

> On 30 Jul 2017, at 14:34, Alan Third <alan <at> idiocy.org> wrote:
> 
> On Sun, Jul 30, 2017 at 02:10:38PM +0200, Nejc Vivod wrote:
>> Tried downloading from emacsformacosx.com
>> <http://emacsformacosx.com/> (both the nightly and the stable
>> version), still have the same issue - I’ve also recreated the file
>> with your echo command. Not sure why it breaks like this, since the
>> preinstalled emacs opens the file just fine.
> 
> The preinstalled Emacs is ancient. Version 22 or something. Quite a
> lot has changed since then. It also only works in the terminal so the
> glyph display code is completely different.
> 
>> What I did notice is, it seems to allocate a bunch of memory every
>> second or so when opening that test file (looking at activity
>> monitor -> Info about the process); before I force-killed it, it was
>> taking up 2,39GB of ram and it didn’t seem like it would stop.
>> 
>> I’m attaching a sample of the process, maybe this can be of help. 
> 
> I don’t really understand what that’s telling me. Is it possible for
> you to run it under a debugger and send me a backtrace?
> 
> You’ll probably have lldb installed already, so all you need to do is
> run
> 
>    lldb /path/to/emacs
>> run
> 
> and once it freezes hit ctrl‐c and
> 
>> bt all
> 
> and send me the output.
> 
> You are running it in GUI mode, and not in the terminal, right?
> 
> -- 
> Alan Third

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Message #41 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Nejc Vivod <nvivod <at> gmail.com>
To: Alan Third <alan <at> idiocy.org>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 15:09:04 +0200

[Message part 1 (text/plain, inline)]

Yeah, I tried running with -Q; I’ve also reran it from lldb with this arg, attaching the backtrace. I’ve got quite a few fonts installed, could that be an issue?

Thanks again for looking into this

[backtrace2.txt (text/plain, attachment)]

[Message part 3 (text/plain, inline)]

> On 30 Jul 2017, at 15:04, Alan Third <alan <at> idiocy.org> wrote:
> 
> On Sun, Jul 30, 2017 at 02:42:45PM +0200, Nejc Vivod wrote:
>> I’m running in gui mode yes. I’ve ran it from lldb, attaching the backtrace. 
> 
> It looks like it’s going into a loop while trying to build a list of
> available fonts.
> 
> I can’t remember if you said you’d tried this, but please try running
> Emacs with the -Q parameter. This bypasses your configuration so we
> can be sure it’s not something in there.
> 
> -- 
> Alan Third

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Message #44 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Nejc Vivod <nvivod <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 16:19:45 +0200

[Message part 1 (text/plain, inline)]

I thought I did, but I might be mistaken. Re-sending the backtrace.

[backtrace2.txt (text/plain, attachment)]

[Message part 3 (text/plain, inline)]

> On 30 Jul 2017, at 16:17, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>> Date: Sun, 30 Jul 2017 14:04:58 +0100
>> From: Alan Third <alan <at> idiocy.org>
>> Cc: 27872 <at> debbugs.gnu.org
>> 
>> On Sun, Jul 30, 2017 at 02:42:45PM +0200, Nejc Vivod wrote:
>>> I’m running in gui mode yes. I’ve ran it from lldb, attaching the backtrace. 
>> 
>> It looks like it’s going into a loop while trying to build a list of
>> available fonts.
> 
> Is it possible to post the backtrace here?
> 
> Also, please always use "Reply to all", so that the bug address is
> CC'ed, and everyone sees the discussion.
> 
> Thanks.

[smime.p7s (application/pkcs7-signature, attachment)]

Message #47 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Nejc Vivod <nvivod <at> gmail.com>
Cc: alan <at> idiocy.org, 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 21:51:52 +0300

> From: Nejc Vivod <nvivod <at> gmail.com>
> Date: Sun, 30 Jul 2017 15:09:04 +0200
> Cc: 27872 <at> debbugs.gnu.org
> 
> Yeah, I tried running with -Q; I’ve also reran it from lldb with this arg, attaching the backtrace. I’ve got quite a few fonts installed, could that be an issue?

Alan, it might help to add some printf in macfont_list that would log
on a file all the fonts that are being scanned there.  Maybe that will
give some hint.

Message #50 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 27872 <at> debbugs.gnu.org, nvivod <at> gmail.com
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 20:27:16 +0100

On Sun, Jul 30, 2017 at 06:29:21PM +0300, Eli Zaretskii wrote:
> > Date: Sun, 30 Jul 2017 16:06:05 +0100
> > From: Alan Third <alan <at> idiocy.org>
> > Cc: Nejc Vivod <nvivod <at> gmail.com>, 27872 <at> debbugs.gnu.org
> > I don’t know if Macs come with non‐colour emoji capable fonts by
> > default, all other Mac apps display the colour ones so I can’t even
> > see a way to test.
> 
> Can you try installing Symbola?  That's the font I see being used here
> for this character.

Now I’ve installed Symbola I get mono emojis in Emacs. There also used
to be a one second or so pause when opening a file with an emoji in
that has now disappeared.

Nejc, can you install Symbola if it’s not already there and see if
that makes a difference?
-- 
Alan Third

Message #53 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Nejc Vivod <nvivod <at> gmail.com>
To: Alan Third <alan <at> idiocy.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 23:53:53 +0200

[Message part 1 (text/plain, inline)]

Now that’s interesting, now it works - opens the file and displays black&white emojis. Thank you all so much for your help! :-)

(though, not having a font installed probably shouldn’t mess it up like this, or am I wrong?)

> On 30 Jul 2017, at 21:27, Alan Third <alan <at> idiocy.org> wrote:
> 
> Symbola

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Message #56 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Nejc Vivod <nvivod <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 30 Jul 2017 23:07:44 +0100

On Sun, Jul 30, 2017 at 11:53:53PM +0200, Nejc Vivod wrote:
> Now that’s interesting, now it works - opens the file and displays
> black&white emojis. Thank you all so much for your help! :-)
> 
> (though, not having a font installed probably shouldn’t mess it up
> like this, or am I wrong?)
> 
> > On 30 Jul 2017, at 21:27, Alan Third <alan <at> idiocy.org> wrote:
> > 
> > Symbola

My understanding is that if you have Symbola installed it’s one of the
first fonts Emacs checks for emoji. If you don’t have it installed, or
Emacs can’t find the glyph it’s looking for, then it searches other
fonts for them.

I think that means you’ve probably got a font that doesn’t get on well
with Emacs. We should be able to find out which one if you’re willing
to try building a custom version which prints out each font family as
it tries them.

I don’t know if it’s worth doing.

-- 
Alan Third

Message #59 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alan Third <alan <at> idiocy.org>
Cc: 27872 <at> debbugs.gnu.org, nvivod <at> gmail.com
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Mon, 31 Jul 2017 06:07:04 +0300

> Date: Sun, 30 Jul 2017 23:07:44 +0100
> From: Alan Third <alan <at> idiocy.org>
> Cc: Eli Zaretskii <eliz <at> gnu.org>, 27872 <at> debbugs.gnu.org
> 
> My understanding is that if you have Symbola installed it’s one of the
> first fonts Emacs checks for emoji. If you don’t have it installed, or
> Emacs can’t find the glyph it’s looking for, then it searches other
> fonts for them.

That's right.

> I think that means you’ve probably got a font that doesn’t get on well
> with Emacs. We should be able to find out which one if you’re willing
> to try building a custom version which prints out each font family as
> it tries them.

I think it means that the freeze wasn't a freeze, but just a very long
search for a font that could support the character.  It was made even
longer by using up a lot of memory, which caused paging and slowed
Emacs down.  Not sure why it used up so much memory, perhaps that's
due to some very large font, or maybe it's a bug in the macOS code
which is involved in the search.

Having Symbola installed is a Good Thing anyway, because Emacs by
default will try to use it for many unusual characters.

Message #64 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Alan Third <alan <at> idiocy.org>, nvivod <at> gmail.com, 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 16 Aug 2020 18:34:11 +0200

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

> I think it means that the freeze wasn't a freeze, but just a very long
> search for a font that could support the character.  It was made even
> longer by using up a lot of memory, which caused paging and slowed
> Emacs down.

I tried reproducing this on Catalina with Emacs 28, and I was unable
to -- Emacs didn't find a font for the burger symbol, but there was no
noticeable delay while looking for the font.  (After installing Symbola
it displayed the character correctly.)

So I'm going to go ahead and guess that this has been fixed now, and I'm
closing this bug report.  If anybody's seeing this on a modern
macOS/Emacs combination, please respond, and we'll reopen.

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

Message #71 received at 27872 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, nvivod <at> gmail.com,
 Alan Third <alan <at> idiocy.org>, 27872 <at> debbugs.gnu.org
Subject: Re: bug#27872: 26.0.50; freeze when opening file with emojis
Date: Sun, 16 Aug 2020 19:03:31 +0200

On Aug 16 2020, Lars Ingebrigtsen wrote:

> I tried reproducing this on Catalina with Emacs 28, and I was unable
> to -- Emacs didn't find a font for the burger symbol, but there was no
> noticeable delay while looking for the font.

That depends on how many fonts you have installed.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

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