GNU bug report logs - #77747
'cursor-face-highlight-mode' signals 'args-out-of-range' in narrowed buffer

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Package: emacs; Reported by: Ship Mints <shipmints@HIDDEN>; dated Fri, 11 Apr 2025 15:33:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Ship Mints <shipmints@HIDDEN>
Date: Fri, 25 Apr 2025 09:51:22 -0400
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Subject: Re: bug#77747: 'cursor-face-highlight-mode' signals
 'args-out-of-range' in narrowed buffer
To: Eli Zaretskii <eliz@HIDDEN>
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On Sun, Apr 13, 2025 at 5:52=E2=80=AFAM Eli Zaretskii <eliz@HIDDEN> wrote:

> > From: Ship Mints <shipmints@HIDDEN>
> > Date: Fri, 11 Apr 2025 11:32:18 -0400
> >
> > -Q reproducer
> >
> > ;; The culprit appears to be `redisplay--update-cursor-face-highlight'
> > (setq debug-on-error t)
> > (cursor-face-highlight-mode)
> > (save-excursion (insert (propertize "cursor face text\n"
> >                                     'cursor-face 'region)))
> > (narrow-to-region (pos-bol) (pos-eol))
> > (setq unread-command-events (mapcar #'identity
> >                                     (kbd "C-n")))
>
> Thanks, does the below fix it?
>
> diff --git a/lisp/simple.el b/lisp/simple.el
> index ee09a6f..9e9dd15 100644
> --- a/lisp/simple.el
> +++ b/lisp/simple.el
> @@ -7265,7 +7265,7 @@ redisplay--update-cursor-face-highlight
>                (pt (window-point window))
>                (cursor-face (get-text-property pt 'cursor-face)))
>          (let* ((start (previous-single-property-change
> -                       (1+ pt) 'cursor-face nil (point-min)))
> +                       (min (1+ pt) (point-min)) 'cursor-face nil
> (point-min)))
>                 (end (next-single-property-change
>                       pt 'cursor-face nil (point-max)))
>                 (new (redisplay--highlight-overlay-function
>

Eli, possible to apply the above soon?

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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:monospace"><span style=3D"font-family:Arial,Helvetica,sans-serif">=
On Sun, Apr 13, 2025 at 5:52=E2=80=AFAM Eli Zaretskii &lt;<a href=3D"mailto=
:eliz@HIDDEN">eliz@HIDDEN</a>&gt; wrote:</span></div></div><div class=3D"=
gmail_quote gmail_quote_container"><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">&gt; From: Ship Mints &lt;<a href=3D"mailto:shipmints@HIDDEN"=
 target=3D"_blank">shipmints@HIDDEN</a>&gt;<br>
&gt; Date: Fri, 11 Apr 2025 11:32:18 -0400<br>
&gt; <br>
&gt; -Q reproducer<br>
&gt; <br>
&gt; ;; The culprit appears to be `redisplay--update-cursor-face-highlight&=
#39;<br>
&gt; (setq debug-on-error t)<br>
&gt; (cursor-face-highlight-mode)<br>
&gt; (save-excursion (insert (propertize &quot;cursor face text\n&quot;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&#39;cursor-f=
ace &#39;region)))<br>
&gt; (narrow-to-region (pos-bol) (pos-eol))<br>
&gt; (setq unread-command-events (mapcar #&#39;identity<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(kbd &quot;C-=
n&quot;)))<br>
<br>
Thanks, does the below fix it?<br>
<br>
diff --git a/lisp/simple.el b/lisp/simple.el<br>
index ee09a6f..9e9dd15 100644<br>
--- a/lisp/simple.el<br>
+++ b/lisp/simple.el<br>
@@ -7265,7 +7265,7 @@ redisplay--update-cursor-face-highlight<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(pt (window-point wi=
ndow))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(cursor-face (get-te=
xt-property pt &#39;cursor-face)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(let* ((start (previous-single-property-c=
hange<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0(1+ pt) &#39;cursor-face nil (point-min)))<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0(min (1+ pt) (point-min)) &#39;cursor-face nil (point-min)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (end (next-single-p=
roperty-change<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 pt &#39;cursor-face nil (point-max)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (new (redisplay--hi=
ghlight-overlay-function<br></blockquote><div><br></div><div class=3D"gmail=
_default" style=3D"font-family:monospace">Eli, possible to apply the above =
soon?</div></div></div>

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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#77747; Package emacs. Full text available.

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From: Ship Mints <shipmints@HIDDEN>
Date: Sun, 13 Apr 2025 08:14:30 -0400
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Subject: Re: bug#77747: 'cursor-face-highlight-mode' signals
 'args-out-of-range' in narrowed buffer
To: Eli Zaretskii <eliz@HIDDEN>
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On Sun, Apr 13, 2025 at 7:56=E2=80=AFAM Eli Zaretskii <eliz@HIDDEN> wrote:

> > From: Ship Mints <shipmints@HIDDEN>
> > Date: Sun, 13 Apr 2025 07:38:34 -0400
> > Cc: 77747 <at> debbugs.gnu.org
> >
> > Your recommendation doesn't work in the reproducer and it signals as
> before.
>
> <Shrug> Granted, it did work for me.
>

<Shrug> here, too.  It seems my changes to simple.el weren't
properly picked up.  I recompiled and it does indeed work in both the
reproducer and in a larger context.

Thank you for taking your time with this.  I'll run with this locally.

-Stephane

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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:monospace"><span style=3D"font-family:Arial,Helvetica,sans-serif">=
On Sun, Apr 13, 2025 at 7:56=E2=80=AFAM Eli Zaretskii &lt;<a href=3D"mailto=
:eliz@HIDDEN">eliz@HIDDEN</a>&gt; wrote:</span></div></div><div class=3D"=
gmail_quote gmail_quote_container"><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">&gt; From: Ship Mints &lt;<a href=3D"mailto:shipmints@HIDDEN"=
 target=3D"_blank">shipmints@HIDDEN</a>&gt;<br>
&gt; Date: Sun, 13 Apr 2025 07:38:34 -0400<br>
&gt; Cc: <a href=3D"mailto:77747 <at> debbugs.gnu.org" target=3D"_blank">77747@d=
ebbugs.gnu.org</a><br>
&gt; <br>
&gt; Your recommendation doesn&#39;t work in the reproducer and it signals =
as before.<br>
<br>
&lt;Shrug&gt; Granted, it did work for me.<br></blockquote><div><br></div><=
div class=3D"gmail_default" style=3D"font-family:monospace">&lt;Shrug&gt; h=
ere, too.=C2=A0 It seems my changes to simple.el weren&#39;t properly=C2=A0=
picked up.=C2=A0 I recompiled and it does indeed work in both the reproduce=
r and in a larger context.</div><div class=3D"gmail_default" style=3D"font-=
family:monospace"><br></div><div class=3D"gmail_default" style=3D"font-fami=
ly:monospace">Thank you for taking your time with this.=C2=A0 I&#39;ll run =
with this locally.</div><div class=3D"gmail_default" style=3D"font-family:m=
onospace"><br></div><div class=3D"gmail_default" style=3D"font-family:monos=
pace">-Stephane</div></div></div>

--0000000000004b59160632a7e1c8--

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bug#77747; Package emacs. Full text available.

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Date: Sun, 13 Apr 2025 14:56:34 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Ship Mints <shipmints@HIDDEN>
In-Reply-To: <CAN+1HbpM2K0bv0w+PoMuhqK9EE3zRgr4vDyxiwdSq3v5vV_vzw@HIDDEN>
 (message from Ship Mints on Sun, 13 Apr 2025 07:38:34 -0400)
Subject: Re: bug#77747: 'cursor-face-highlight-mode' signals
 'args-out-of-range' in narrowed buffer
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> From: Ship Mints <shipmints@HIDDEN>
> Date: Sun, 13 Apr 2025 07:38:34 -0400
> Cc: 77747 <at> debbugs.gnu.org
> 
> Your recommendation doesn't work in the reproducer and it signals as before.

<Shrug> Granted, it did work for me.

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Date: Sun, 13 Apr 2025 14:55:20 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Ship Mints <shipmints@HIDDEN>, spacibba@HIDDEN
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 (message from Ship Mints on Sun, 13 Apr 2025 07:28:43 -0400)
Subject: Re: bug#77747: 'cursor-face-highlight-mode' signals
 'args-out-of-range' in narrowed buffer
References: <CAN+1HbrcbGaR8atcJWL_VnPLMPaHEFB4-R4p97z4i=2=H+WKcg@HIDDEN>
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> From: Ship Mints <shipmints@HIDDEN>
> Date: Sun, 13 Apr 2025 07:28:43 -0400
> Cc: 77747 <at> debbugs.gnu.org
> 
> On Sun, Apr 13, 2025 at 5:52 AM Eli Zaretskii <eliz@HIDDEN> wrote:
> 
>  > From: Ship Mints <shipmints@HIDDEN>
>  > Date: Fri, 11 Apr 2025 11:32:18 -0400
>  > 
>  > -Q reproducer
>  > 
>  > ;; The culprit appears to be `redisplay--update-cursor-face-highlight'
>  > (setq debug-on-error t)
>  > (cursor-face-highlight-mode)
>  > (save-excursion (insert (propertize "cursor face text\n"
>  >                                     'cursor-face 'region)))
>  > (narrow-to-region (pos-bol) (pos-eol))
>  > (setq unread-command-events (mapcar #'identity
>  >                                     (kbd "C-n")))
> 
>  Thanks, does the below fix it?
> 
>  diff --git a/lisp/simple.el b/lisp/simple.el
>  index ee09a6f..9e9dd15 100644
>  --- a/lisp/simple.el
>  +++ b/lisp/simple.el
>  @@ -7265,7 +7265,7 @@ redisplay--update-cursor-face-highlight
>                 (pt (window-point window))
>                 (cursor-face (get-text-property pt 'cursor-face)))
>           (let* ((start (previous-single-property-change
>  -                       (1+ pt) 'cursor-face nil (point-min)))
>  +                       (min (1+ pt) (point-min)) 'cursor-face nil (point-min)))
>                  (end (next-single-property-change
>                        pt 'cursor-face nil (point-max)))
>                  (new (redisplay--highlight-overlay-function
> 
> Not quite.  That winds up coalescing the highlight across lines rather than just the line with the cursor.
> 
> This works better but I'm not sure if this is in the true spirit of the intended use as the property change may
> not be floored to bol?

I guess it's up to the author (CC'ed), then.

Information forwarded to bug-gnu-emacs@HIDDEN:
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From: Ship Mints <shipmints@HIDDEN>
Date: Sun, 13 Apr 2025 07:38:34 -0400
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Subject: Re: bug#77747: 'cursor-face-highlight-mode' signals
 'args-out-of-range' in narrowed buffer
To: Eli Zaretskii <eliz@HIDDEN>
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On Sun, Apr 13, 2025 at 7:28=E2=80=AFAM Ship Mints <shipmints@HIDDEN> wr=
ote:

> On Sun, Apr 13, 2025 at 5:52=E2=80=AFAM Eli Zaretskii <eliz@HIDDEN> wrot=
e:
>
>> > From: Ship Mints <shipmints@HIDDEN>
>> > Date: Fri, 11 Apr 2025 11:32:18 -0400
>> >
>> > -Q reproducer
>> >
>> > ;; The culprit appears to be `redisplay--update-cursor-face-highlight'
>> > (setq debug-on-error t)
>> > (cursor-face-highlight-mode)
>> > (save-excursion (insert (propertize "cursor face text\n"
>> >                                     'cursor-face 'region)))
>> > (narrow-to-region (pos-bol) (pos-eol))
>> > (setq unread-command-events (mapcar #'identity
>> >                                     (kbd "C-n")))
>>
>> Thanks, does the below fix it?
>>
>> diff --git a/lisp/simple.el b/lisp/simple.el
>> index ee09a6f..9e9dd15 100644
>> --- a/lisp/simple.el
>> +++ b/lisp/simple.el
>> @@ -7265,7 +7265,7 @@ redisplay--update-cursor-face-highlight
>>                (pt (window-point window))
>>                (cursor-face (get-text-property pt 'cursor-face)))
>>          (let* ((start (previous-single-property-change
>> -                       (1+ pt) 'cursor-face nil (point-min)))
>> +                       (min (1+ pt) (point-min)) 'cursor-face nil
>> (point-min)))
>>                 (end (next-single-property-change
>>                       pt 'cursor-face nil (point-max)))
>>                 (new (redisplay--highlight-overlay-function
>>
>
> Not quite.  That winds up coalescing the highlight across lines rather
> than just the line with the cursor.
>
> This works better but I'm not sure if this is in the true spirit of the
> intended use as the property change may not be floored to bol?
>
> diff --git a/lisp/simple.el b/lisp/simple.el
> index 7037158df8d..9ebe9a0ba34 100644
> --- a/lisp/simple.el
> +++ b/lisp/simple.el
> @@ -7259,7 +7259,7 @@ redisplay--update-cursor-face-highlight
>                (pt (window-point window))
>                (cursor-face (get-text-property pt 'cursor-face)))
>          (let* ((start (previous-single-property-change
> -                       (1+ pt) 'cursor-face nil (point-min)))
> +                       (min (1+ pt) (pos-bol)) 'cursor-face nil
> (point-min)))
>                 (end (next-single-property-change
>                       pt 'cursor-face nil (point-max)))
>                 (new (redisplay--highlight-overlay-function
>

I tested my experiment above in my own reproducer and it doesn't work
there, though it worked in a larger case with a lot more text, I didn't
look further.

Your recommendation doesn't work in the reproducer and it signals as before=
.

--000000000000ce91550632a76092
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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:monospace"><span style=3D"font-family:Arial,Helvetica,sans-serif">=
On Sun, Apr 13, 2025 at 7:28=E2=80=AFAM Ship Mints &lt;<a href=3D"mailto:sh=
ipmints@HIDDEN">shipmints@HIDDEN</a>&gt; wrote:</span></div></div><di=
v class=3D"gmail_quote gmail_quote_container"><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div style=3D"font-f=
amily:monospace"><span style=3D"font-family:Arial,Helvetica,sans-serif">On =
Sun, Apr 13, 2025 at 5:52=E2=80=AFAM Eli Zaretskii &lt;<a href=3D"mailto:el=
iz@HIDDEN" target=3D"_blank">eliz@HIDDEN</a>&gt; wrote:</span></div></div=
><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x">&gt; From: Ship Mints &lt;<a href=3D"mailto:shipmints@HIDDEN" target=
=3D"_blank">shipmints@HIDDEN</a>&gt;<br>
&gt; Date: Fri, 11 Apr 2025 11:32:18 -0400<br>
&gt; <br>
&gt; -Q reproducer<br>
&gt; <br>
&gt; ;; The culprit appears to be `redisplay--update-cursor-face-highlight&=
#39;<br>
&gt; (setq debug-on-error t)<br>
&gt; (cursor-face-highlight-mode)<br>
&gt; (save-excursion (insert (propertize &quot;cursor face text\n&quot;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&#39;cursor-f=
ace &#39;region)))<br>
&gt; (narrow-to-region (pos-bol) (pos-eol))<br>
&gt; (setq unread-command-events (mapcar #&#39;identity<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(kbd &quot;C-=
n&quot;)))<br>
<br>
Thanks, does the below fix it?<br>
<br>
diff --git a/lisp/simple.el b/lisp/simple.el<br>
index ee09a6f..9e9dd15 100644<br>
--- a/lisp/simple.el<br>
+++ b/lisp/simple.el<br>
@@ -7265,7 +7265,7 @@ redisplay--update-cursor-face-highlight<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(pt (window-point wi=
ndow))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(cursor-face (get-te=
xt-property pt &#39;cursor-face)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(let* ((start (previous-single-property-c=
hange<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0(1+ pt) &#39;cursor-face nil (point-min)))<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0(min (1+ pt) (point-min)) &#39;cursor-face nil (point-min)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (end (next-single-p=
roperty-change<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 pt &#39;cursor-face nil (point-max)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (new (redisplay--hi=
ghlight-overlay-function<br></blockquote><div><br></div><div style=3D"font-=
family:monospace">Not quite.=C2=A0 That winds up coalescing the highlight a=
cross lines rather than just the line with the cursor.</div><div style=3D"f=
ont-family:monospace"><br></div><div style=3D"font-family:monospace">This w=
orks better but I&#39;m not sure if this is in the true spirit of the inten=
ded use as the property change=C2=A0may not be floored to bol?</div><div st=
yle=3D"font-family:monospace"><br></div><div style=3D"font-family:monospace=
">diff --git a/lisp/simple.el b/lisp/simple.el<br>index 7037158df8d..9ebe9a=
0ba34 100644<br>--- a/lisp/simple.el<br>+++ b/lisp/simple.el<br>@@ -7259,7 =
+7259,7 @@ redisplay--update-cursor-face-highlight<br>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(pt (window-point window))<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(cursor-face (get-text-propert=
y pt &#39;cursor-face)))<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(let* ((start=
 (previous-single-property-change<br>- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (1+ pt) &#39;cursor-face nil (poi=
nt-min)))<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 (min (1+ pt) (pos-bol)) &#39;cursor-face nil (point-min))=
)<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (end (next-sin=
gle-property-change<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 pt &#39;cursor-face nil (point-max)))<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (new (redisplay--highlight=
-overlay-function<br></div></div></div></blockquote><div><br></div><div cla=
ss=3D"gmail_default" style=3D"font-family:monospace">I tested my experiment=
 above in my own reproducer and it doesn&#39;t work there, though it worked=
 in a larger case with a lot more text, I didn&#39;t look further.</div><di=
v class=3D"gmail_default" style=3D"font-family:monospace"><br></div><div cl=
ass=3D"gmail_default" style=3D"font-family:monospace">Your recommendation d=
oesn&#39;t work in the reproducer and it signals as before.</div></div></di=
v>

--000000000000ce91550632a76092--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#77747; Package emacs. Full text available.

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In-Reply-To: <86wmbojslo.fsf@HIDDEN>
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Date: Sun, 13 Apr 2025 07:28:43 -0400
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Subject: Re: bug#77747: 'cursor-face-highlight-mode' signals
 'args-out-of-range' in narrowed buffer
To: Eli Zaretskii <eliz@HIDDEN>
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--0000000000008f3ad40632a73dbb
Content-Type: text/plain; charset="UTF-8"
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On Sun, Apr 13, 2025 at 5:52=E2=80=AFAM Eli Zaretskii <eliz@HIDDEN> wrote:

> > From: Ship Mints <shipmints@HIDDEN>
> > Date: Fri, 11 Apr 2025 11:32:18 -0400
> >
> > -Q reproducer
> >
> > ;; The culprit appears to be `redisplay--update-cursor-face-highlight'
> > (setq debug-on-error t)
> > (cursor-face-highlight-mode)
> > (save-excursion (insert (propertize "cursor face text\n"
> >                                     'cursor-face 'region)))
> > (narrow-to-region (pos-bol) (pos-eol))
> > (setq unread-command-events (mapcar #'identity
> >                                     (kbd "C-n")))
>
> Thanks, does the below fix it?
>
> diff --git a/lisp/simple.el b/lisp/simple.el
> index ee09a6f..9e9dd15 100644
> --- a/lisp/simple.el
> +++ b/lisp/simple.el
> @@ -7265,7 +7265,7 @@ redisplay--update-cursor-face-highlight
>                (pt (window-point window))
>                (cursor-face (get-text-property pt 'cursor-face)))
>          (let* ((start (previous-single-property-change
> -                       (1+ pt) 'cursor-face nil (point-min)))
> +                       (min (1+ pt) (point-min)) 'cursor-face nil
> (point-min)))
>                 (end (next-single-property-change
>                       pt 'cursor-face nil (point-max)))
>                 (new (redisplay--highlight-overlay-function
>

Not quite.  That winds up coalescing the highlight across lines rather than
just the line with the cursor.

This works better but I'm not sure if this is in the true spirit of the
intended use as the property change may not be floored to bol?

diff --git a/lisp/simple.el b/lisp/simple.el
index 7037158df8d..9ebe9a0ba34 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -7259,7 +7259,7 @@ redisplay--update-cursor-face-highlight
               (pt (window-point window))
               (cursor-face (get-text-property pt 'cursor-face)))
         (let* ((start (previous-single-property-change
-                       (1+ pt) 'cursor-face nil (point-min)))
+                       (min (1+ pt) (pos-bol)) 'cursor-face nil
(point-min)))
                (end (next-single-property-change
                      pt 'cursor-face nil (point-max)))
                (new (redisplay--highlight-overlay-function

--0000000000008f3ad40632a73dbb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:monospace"><span style=3D"font-family:Arial,Helvetica,sans-serif">=
On Sun, Apr 13, 2025 at 5:52=E2=80=AFAM Eli Zaretskii &lt;<a href=3D"mailto=
:eliz@HIDDEN">eliz@HIDDEN</a>&gt; wrote:</span></div></div><div class=3D"=
gmail_quote gmail_quote_container"><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">&gt; From: Ship Mints &lt;<a href=3D"mailto:shipmints@HIDDEN"=
 target=3D"_blank">shipmints@HIDDEN</a>&gt;<br>
&gt; Date: Fri, 11 Apr 2025 11:32:18 -0400<br>
&gt; <br>
&gt; -Q reproducer<br>
&gt; <br>
&gt; ;; The culprit appears to be `redisplay--update-cursor-face-highlight&=
#39;<br>
&gt; (setq debug-on-error t)<br>
&gt; (cursor-face-highlight-mode)<br>
&gt; (save-excursion (insert (propertize &quot;cursor face text\n&quot;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&#39;cursor-f=
ace &#39;region)))<br>
&gt; (narrow-to-region (pos-bol) (pos-eol))<br>
&gt; (setq unread-command-events (mapcar #&#39;identity<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(kbd &quot;C-=
n&quot;)))<br>
<br>
Thanks, does the below fix it?<br>
<br>
diff --git a/lisp/simple.el b/lisp/simple.el<br>
index ee09a6f..9e9dd15 100644<br>
--- a/lisp/simple.el<br>
+++ b/lisp/simple.el<br>
@@ -7265,7 +7265,7 @@ redisplay--update-cursor-face-highlight<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(pt (window-point wi=
ndow))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(cursor-face (get-te=
xt-property pt &#39;cursor-face)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(let* ((start (previous-single-property-c=
hange<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0(1+ pt) &#39;cursor-face nil (point-min)))<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0(min (1+ pt) (point-min)) &#39;cursor-face nil (point-min)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (end (next-single-p=
roperty-change<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 pt &#39;cursor-face nil (point-max)))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (new (redisplay--hi=
ghlight-overlay-function<br></blockquote><div><br></div><div class=3D"gmail=
_default" style=3D"font-family:monospace">Not quite.=C2=A0 That winds up co=
alescing the highlight across lines rather than just the line with the curs=
or.</div><div class=3D"gmail_default" style=3D"font-family:monospace"><br><=
/div><div class=3D"gmail_default" style=3D"font-family:monospace">This work=
s better but I&#39;m not sure if this is in the true spirit of the intended=
 use as the property change=C2=A0may not be floored to bol?</div><div class=
=3D"gmail_default" style=3D"font-family:monospace"><br></div><div class=3D"=
gmail_default" style=3D"font-family:monospace">diff --git a/lisp/simple.el =
b/lisp/simple.el<br>index 7037158df8d..9ebe9a0ba34 100644<br>--- a/lisp/sim=
ple.el<br>+++ b/lisp/simple.el<br>@@ -7259,7 +7259,7 @@ redisplay--update-c=
ursor-face-highlight<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0(pt (window-point window))<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0(cursor-face (get-text-property pt &#39;cursor-face)))<br>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(let* ((start (previous-single-property-c=
hange<br>- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 (1+ pt) &#39;cursor-face nil (point-min)))<br>+ =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (min (1+ pt=
) (pos-bol)) &#39;cursor-face nil (point-min)))<br>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (end (next-single-property-change<br>=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pt &=
#39;cursor-face nil (point-max)))<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 (new (redisplay--highlight-overlay-function<br></div></di=
v></div>

--0000000000008f3ad40632a73dbb--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#77747; Package emacs. Full text available.

Message received at 77747 <at> debbugs.gnu.org:

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Date: Sun, 13 Apr 2025 12:52:51 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Ship Mints <shipmints@HIDDEN>
In-Reply-To: <CAN+1HbrcbGaR8atcJWL_VnPLMPaHEFB4-R4p97z4i=2=H+WKcg@HIDDEN>
 (message from Ship Mints on Fri, 11 Apr 2025 11:32:18 -0400)
Subject: Re: bug#77747: 'cursor-face-highlight-mode' signals
 'args-out-of-range' in narrowed buffer
References: <CAN+1HbrcbGaR8atcJWL_VnPLMPaHEFB4-R4p97z4i=2=H+WKcg@HIDDEN>
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> From: Ship Mints <shipmints@HIDDEN>
> Date: Fri, 11 Apr 2025 11:32:18 -0400
> 
> -Q reproducer
> 
> ;; The culprit appears to be `redisplay--update-cursor-face-highlight'
> (setq debug-on-error t)
> (cursor-face-highlight-mode)
> (save-excursion (insert (propertize "cursor face text\n"
>                                     'cursor-face 'region)))
> (narrow-to-region (pos-bol) (pos-eol))
> (setq unread-command-events (mapcar #'identity
>                                     (kbd "C-n")))

Thanks, does the below fix it?

diff --git a/lisp/simple.el b/lisp/simple.el
index ee09a6f..9e9dd15 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -7265,7 +7265,7 @@ redisplay--update-cursor-face-highlight
               (pt (window-point window))
               (cursor-face (get-text-property pt 'cursor-face)))
         (let* ((start (previous-single-property-change
-                       (1+ pt) 'cursor-face nil (point-min)))
+                       (min (1+ pt) (point-min)) 'cursor-face nil (point-min)))
                (end (next-single-property-change
                      pt 'cursor-face nil (point-max)))
                (new (redisplay--highlight-overlay-function

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#77747; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:

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Subject: 'cursor-face-highlight-mode' signals 'args-out-of-range' in narrowed
 buffer
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--000000000000175f53063282692b
Content-Type: text/plain; charset="UTF-8"

-Q reproducer

;; The culprit appears to be `redisplay--update-cursor-face-highlight'
(setq debug-on-error t)
(cursor-face-highlight-mode)
(save-excursion (insert (propertize "cursor face text\n"
                                    'cursor-face 'region)))
(narrow-to-region (pos-bol) (pos-eol))
(setq unread-command-events (mapcar #'identity
                                    (kbd "C-n")))

-Stephane

--000000000000175f53063282692b
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac=
e">-Q reproducer</div><div class=3D"gmail_default" style=3D"font-family:mon=
ospace"><br></div><div class=3D"gmail_default" style=3D"font-family:monospa=
ce">;; The culprit appears to be `redisplay--update-cursor-face-highlight&#=
39;</div><div class=3D"gmail_default" style=3D"font-family:monospace">(setq=
 debug-on-error t)<br>(cursor-face-highlight-mode)<br>(save-excursion (inse=
rt (propertize &quot;cursor face text\n&quot;<br>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &#39;cursor-face &#39;region)))<br>(narrow-to-r=
egion (pos-bol) (pos-eol))<br>(setq unread-command-events (mapcar #&#39;ide=
ntity<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (kbd &quot;C-n&=
quot;)))<br></div><div class=3D"gmail_default" style=3D"font-family:monospa=
ce"><br></div><div class=3D"gmail_default" style=3D"font-family:monospace">=
-Stephane</div></div>

--000000000000175f53063282692b--

Acknowledgement sent to Ship Mints <shipmints@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.

Report forwarded to bug-gnu-emacs@HIDDEN:
bug#77747; Package emacs. Full text available.

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