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Date: Wed, 02 Apr 2025 17:52:27 +0300
Message-Id: <86h6361uqc.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: gerd.moellmann@HIDDEN
In-Reply-To: <86iknm1uy4.fsf@HIDDEN> (message from Eli Zaretskii on Wed, 02
Apr 2025 17:47:47 +0300)
Subject: Re: bug#77452: 31.0.50; Wide characters in left margin on ttys
References: <m2ecyax53l.fsf@HIDDEN> <86o6xe20yd.fsf@HIDDEN>
<m2a58yww7c.fsf@HIDDEN> <86iknm1uy4.fsf@HIDDEN>
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> Cc: 77452 <at> debbugs.gnu.org
> Date: Wed, 02 Apr 2025 17:47:47 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
>
> > I tried to read and understand display_line etc. this morning, but I'm afraid
> > there is too much going on there for me to find the cause of this in
> > reasonable time.
>
> Does the below look right to you?
Sorry, please try the slightly more safe change below:
diff --git a/src/xdisp.c b/src/xdisp.c
index 2c676c0..33d7314 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -25685,7 +25685,7 @@ #define RECORD_MAX_MIN_POS(IT) \
/* Now, get the metrics of what we want to display. This also
generates glyphs in `row' (which is IT->glyph_row). */
- n_glyphs_before = row->used[TEXT_AREA];
+ n_glyphs_before = row->used[it->area];
x = it->current_x;
/* Remember the line height so far in case the next element doesn't
@@ -25732,6 +25732,7 @@ #define RECORD_MAX_MIN_POS(IT) \
the next one. */
if (it->area != TEXT_AREA)
{
+ enum glyph_row_area area = it->area;
row->ascent = max (row->ascent, it->max_ascent);
row->height = max (row->height, it->max_ascent + it->max_descent);
row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent);
@@ -25740,6 +25741,15 @@ #define RECORD_MAX_MIN_POS(IT) \
row->extra_line_spacing = max (row->extra_line_spacing,
it->max_extra_line_spacing);
set_iterator_to_next (it, true);
+ if (!FRAME_WINDOW_P (it->f)
+ /* If we exhausted the glyphs of the marginal area... */
+ it->area != area
+ /* ...and the last character was multi-column... */
+ && it->nglyphs > 1
+ /* ...and not all of its glyphs fit in the marginalk area... */
+ && row->used[area] < n_glyphs_before + it->nglyphs)
+ /* ...then reset back to the previous character. */
+ row->used[area] = n_glyphs_before;
/* If we didn't handle the line/wrap prefix above, and the
call to set_iterator_to_next just switched to TEXT_AREA,
process the prefix now. */
bug-gnu-emacs@HIDDEN:bug#77452; Package emacs.
Full text available.
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Date: Wed, 02 Apr 2025 17:47:47 +0300
Message-Id: <86iknm1uy4.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
In-Reply-To: <m2a58yww7c.fsf@HIDDEN> (message from Gerd =?utf-8?Q?M?=
=?utf-8?Q?=C3=B6llmann?= on Wed, 02 Apr 2025 15:04:55 +0200)
Subject: Re: bug#77452: 31.0.50; Wide characters in left margin on ttys
References: <m2ecyax53l.fsf@HIDDEN> <86o6xe20yd.fsf@HIDDEN>
<m2a58yww7c.fsf@HIDDEN>
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> From: Gerd Möllmann <gerd.moellmann@HIDDEN>
> Cc: 77452 <at> debbugs.gnu.org
> Date: Wed, 02 Apr 2025 15:04:55 +0200
>
> Eli Zaretskii <eliz@HIDDEN> writes:
>
> > The problem is not the char-width of 💡 nor with advancement of the
> > cursor, the problem is that the string "1💡" doesn't fit in the
> > 2-column wide margin, and Emacs should have displayed only "1", since
> > we cannot clip glyphs on TTY frames.
>
> Exactly, that pretty much what I meant :-). The wide character may not
> be output to the terminal, otherwise display and matrices get out of
> sync.
>
> > Are you going to work on fixing this long-time problem? Or should I?
>
> I tried to read and understand display_line etc. this morning, but I'm afraid
> there is too much going on there for me to find the cause of this in
> reasonable time.
Does the below look right to you?
diff --git a/src/xdisp.c b/src/xdisp.c
index 2c676c0..1c54e7c 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -25685,7 +25685,7 @@ #define RECORD_MAX_MIN_POS(IT) \
/* Now, get the metrics of what we want to display. This also
generates glyphs in `row' (which is IT->glyph_row). */
- n_glyphs_before = row->used[TEXT_AREA];
+ n_glyphs_before = row->used[it->area];
x = it->current_x;
/* Remember the line height so far in case the next element doesn't
@@ -25732,6 +25732,7 @@ #define RECORD_MAX_MIN_POS(IT) \
the next one. */
if (it->area != TEXT_AREA)
{
+ enum glyph_row_area area = it->area;
row->ascent = max (row->ascent, it->max_ascent);
row->height = max (row->height, it->max_ascent + it->max_descent);
row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent);
@@ -25740,6 +25741,14 @@ #define RECORD_MAX_MIN_POS(IT) \
row->extra_line_spacing = max (row->extra_line_spacing,
it->max_extra_line_spacing);
set_iterator_to_next (it, true);
+ /* If we exhausted the glyphs of the marginal area... */
+ if (it->area != area
+ /* ...and the last character was multi-column... */
+ && it->nglyphs > 1
+ /* ...and not all of its glyphs fit in the marginal area... */
+ && row->used[area] < n_glyphs_before + it->nglyphs)
+ /* ...then reset back to the previous character. */
+ row->used[area] = n_glyphs_before;
/* If we didn't handle the line/wrap prefix above, and the
call to set_iterator_to_next just switched to TEXT_AREA,
process the prefix now. */
bug-gnu-emacs@HIDDEN:bug#77452; Package emacs.
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[2003:e0:b70a:9c00:4129:7a09:c802:67cb]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39c0b7a4318sm16628744f8f.87.2025.04.02.06.04.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Apr 2025 06:04:56 -0700 (PDT) From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN> To: Eli Zaretskii <eliz@HIDDEN> Subject: Re: bug#77452: 31.0.50; Wide characters in left margin on ttys In-Reply-To: <86o6xe20yd.fsf@HIDDEN> References: <m2ecyax53l.fsf@HIDDEN> <86o6xe20yd.fsf@HIDDEN> Date: Wed, 02 Apr 2025 15:04:55 +0200 Message-ID: <m2a58yww7c.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 77452 Cc: 77452 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Eli Zaretskii <eliz@HIDDEN> writes: >> From: Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> >> Date: Wed, 02 Apr 2025 11:52:46 +0200 >>=20 >> in emacs -Q -nw, eval=20 >>=20 >> (defun foo () >> (interactive) >> (with-current-buffer (get-buffer-create "*foo*") >> (setq left-margin-width 2) >> (erase-buffer) >> (insert "abc") >> (insert (propertize "def" 'display '((margin left-margin) "1=F0=9F= =92=A1"))))) >>=20 >> and M-x foo. >>=20 >> This creates a buffer "*foo*" displaying a string in a left >> margin area of width 2. The string consists of 2 characters but has a di= splay >> width of 3 since the light bulb character has a display width of 2. >>=20 >> (char-width ?=F0=9F=92=A1) >> =3D> 2 >>=20 >> So, writing the left margin string to the terminal advances the output >> cursor by 3 not 2. This confuses the display engine, as one can witness >> by editing in the *foo* buffer, adding new lines etc. > > The problem is not the char-width of =F0=9F=92=A1 nor with advancement of= the > cursor, the problem is that the string "1=F0=9F=92=A1" doesn't fit in the > 2-column wide margin, and Emacs should have displayed only "1", since > we cannot clip glyphs on TTY frames. Exactly, that pretty much what I meant :-). The wide character may not be output to the terminal, otherwise display and matrices get out of sync. > Are you going to work on fixing this long-time problem? Or should I? I tried to read and understand display_line etc. this morning, but I'm afra= id there is too much going on there for me to find the cause of this in reasonable time.
bug-gnu-emacs@HIDDEN:bug#77452; Package emacs.
Full text available.Received: (at 77452) by debbugs.gnu.org; 2 Apr 2025 12:38:55 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Apr 02 08:38:55 2025 Received: from localhost ([127.0.0.1]:55966 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tzxMs-00057M-E3 for submit <at> debbugs.gnu.org; Wed, 02 Apr 2025 08:38:54 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:39654) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1tzxMp-00056K-SB for 77452 <at> debbugs.gnu.org; Wed, 02 Apr 2025 08:38:52 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1tzxMk-0004RR-Dn; Wed, 02 Apr 2025 08:38:46 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-version:References:Subject:In-Reply-To:To:From: Date; bh=Klc36QIby17cEpwocFo1AlxRj2UEG4cS+sxedhTtF3g=; b=bSEPRz6olekEsslE1CBf AFCQfKmgqrQ+Wvb3RiILD+e/t8RohQnDMAbbr+66HyhLXVk5iRVlcunGCTPbXKHO8YjvmCjcvwwVP 8aGxEMKMQXc6PFDOK/OZXTyEeFqURg7tgOUqxvjxI3VlpCPd9uxCJSHxe5Tki1ACG4u0pFObJkKfy 9hZ8s4qylFZDJJQ0kGnpQbfrTYVCYhm4c0p51hewX0KaHbeOEtX4J1LybROZkMoVKQ7lnRvoTcEUJ n3Kq/uZfKyGRbBe2b8RnfPaBvgsGaP7DJWf2eqUuTsstg9pGw31AGP3eTBAsCxia2wiKXUHv42TP9 8DHvqHEabypr8A==; Date: Wed, 02 Apr 2025 15:38:02 +0300 Message-Id: <86o6xe20yd.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN> In-Reply-To: <m2ecyax53l.fsf@HIDDEN> (message from Gerd =?utf-8?Q?M?= =?utf-8?Q?=C3=B6llmann?= on Wed, 02 Apr 2025 11:52:46 +0200) Subject: Re: bug#77452: 31.0.50; Wide characters in left margin on ttys References: <m2ecyax53l.fsf@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 77452 Cc: 77452 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > From: Gerd Möllmann <gerd.moellmann@HIDDEN> > Date: Wed, 02 Apr 2025 11:52:46 +0200 > > in emacs -Q -nw, eval > > (defun foo () > (interactive) > (with-current-buffer (get-buffer-create "*foo*") > (setq left-margin-width 2) > (erase-buffer) > (insert "abc") > (insert (propertize "def" 'display '((margin left-margin) "1💡"))))) > > and M-x foo. > > This creates a buffer "*foo*" displaying a string in a left > margin area of width 2. The string consists of 2 characters but has a display > width of 3 since the light bulb character has a display width of 2. > > (char-width ?💡) > => 2 > > So, writing the left margin string to the terminal advances the output > cursor by 3 not 2. This confuses the display engine, as one can witness > by editing in the *foo* buffer, adding new lines etc. The problem is not the char-width of 💡 nor with advancement of the cursor, the problem is that the string "1💡" doesn't fit in the 2-column wide margin, and Emacs should have displayed only "1", since we cannot clip glyphs on TTY frames. Are you going to work on fixing this long-time problem? Or should I?
bug-gnu-emacs@HIDDEN:bug#77452; Package emacs.
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From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
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Subject: 31.0.50; Wide characters in left margin on ttys
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in emacs -Q -nw, eval=20
(defun foo ()
(interactive)
(with-current-buffer (get-buffer-create "*foo*")
(setq left-margin-width 2)
(erase-buffer)
(insert "abc")
(insert (propertize "def" 'display '((margin left-margin) "1=F0=9F=92=
=A1")))))
and M-x foo.
This creates a buffer "*foo*" displaying a string in a left
margin area of width 2. The string consists of 2 characters but has a displ=
ay
width of 3 since the light bulb character has a display width of 2.
(char-width ?=F0=9F=92=A1)
=3D> 2
So, writing the left margin string to the terminal advances the output
cursor by 3 not 2. This confuses the display engine, as one can witness
by editing in the *foo* buffer, adding new lines etc.
In GNU Emacs 31.0.50 (build 1, aarch64-apple-darwin24.3.0, NS
appkit-2575.40 Version 15.3.2 (Build 24D81)) of 2025-04-02 built on
pro2
Repository revision: 71b3298c0e813ba1432e75370c460eea5caf72d5
Repository branch: master
System Description: macOS 15.3.2
Gerd Möllmann <gerd.moellmann@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#77452; Package emacs.
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