GNU bug report logs - #32851
26.1.50; show-paren-mode disables off-screen-paren-match

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Package: emacs; Reported by: Stefan Guath <stefan@HIDDEN>; dated Thu, 27 Sep 2018 09:43:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Stefan Guath <stefan@HIDDEN>
Date: Thu, 27 Sep 2018 13:15:04 +0200
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Subject: Re: bug#32851: 26.1.50;
 show-paren-mode disables off-screen-paren-match
To: eliz@HIDDEN
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 Content preview:  Yes, if I comment out the line "(not show-paren-mode)" in
 the function blink-matching-open, I observe the same thing. During the short
 time that the point is temporarily moved to the correct matching paren, the
 old/previous highlighted parens are still visible. If they could be updated
 before the jump rather than after, then the problem would be solved. But
 as you say, that would require more changes to the code. To be honest, the
 execution paths in this piece of code is not obvious to me, so I'm rather
 puzzled where to begin... [...] 
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Yes, if I comment out the line "(not show-paren-mode)" in the function
blink-matching-open, I observe the same thing. During the short time that
the point is temporarily moved to the correct matching paren, the
old/previous highlighted parens are still visible. If they could be updated
before the jump rather than after, then the problem would be solved. But as
you say, that would require more changes to the code. To be honest, the
execution paths in this piece of code is not obvious to me, so I'm rather
puzzled where to begin...

On Thu, Sep 27, 2018 at 12:43 PM Eli Zaretskii <eliz@HIDDEN> wrote:

> > From: Stefan Guath <stefan@HIDDEN>
> > Date: Thu, 27 Sep 2018 11:35:06 +0200
> >
> > When show-paren-mode is enabled, the only respected setting for
> blink-matching-paren is "any other non-nil
> > value" which echos matched parens only when they are off-screen. The
> settings t, 'jump and 'jump-offscreen
> > are disabled.
> >
> > I can understand why the settings t and 'jump are disregarded since it
> would just be a redundant functionality
> > of show-paren-mode. But I don't understand why the setting
> 'jump-offscreen is disregarded. I think it's a better
> > option than "echo match off screen paren" since i) a jump (i.e. a
> scroll) gives more context than a one-liner in
> > the echo area, and ii) it's very convenient to get a semantic based
> scroll operation automatically.
>
> Did you try to remove the condition that show-paren-mode is active?
> When I try that, I see an unpleasant effect: when blink-matching-paren
> jumps off-screen, the wrong opening parenthesis is highlighted
> (although the jump is to the right place).
>
> So allowing jump-offscreen and show-paren-mode to coexist will need
> more changes than just removing the condition.
>

--0000000000006472a10576d8742c
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr">Yes, if I comment out th=
e line &quot;(not show-paren-mode)&quot; in the function blink-matching-ope=
n, I observe the same thing. During the short time that the point is tempor=
arily moved to the correct matching paren, the old/previous highlighted par=
ens are still visible. If they could be updated before the jump rather than=
 after, then the problem would be solved. But as you say, that would requir=
e more changes to the code. To be honest, the execution paths in this piece=
 of code is not obvious to me, so I&#39;m rather puzzled where to begin...<=
br></div></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Thu=
, Sep 27, 2018 at 12:43 PM Eli Zaretskii &lt;<a href=3D"mailto:eliz@HIDDEN=
">eliz@HIDDEN</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">&gt; =
From: Stefan Guath &lt;<a href=3D"mailto:stefan@HIDDEN" target=3D"_bla=
nk">stefan@HIDDEN</a>&gt;<br>
&gt; Date: Thu, 27 Sep 2018 11:35:06 +0200<br>
&gt; <br>
&gt; When show-paren-mode is enabled, the only respected setting for blink-=
matching-paren is &quot;any other non-nil<br>
&gt; value&quot; which echos matched parens only when they are off-screen. =
The settings t, &#39;jump and &#39;jump-offscreen<br>
&gt; are disabled.<br>
&gt; <br>
&gt; I can understand why the settings t and &#39;jump are disregarded sinc=
e it would just be a redundant functionality<br>
&gt; of show-paren-mode. But I don&#39;t understand why the setting &#39;ju=
mp-offscreen is disregarded. I think it&#39;s a better<br>
&gt; option than &quot;echo match off screen paren&quot; since i) a jump (i=
.e. a scroll) gives more context than a one-liner in<br>
&gt; the echo area, and ii) it&#39;s very convenient to get a semantic base=
d scroll operation automatically.<br>
<br>
Did you try to remove the condition that show-paren-mode is active?<br>
When I try that, I see an unpleasant effect: when blink-matching-paren<br>
jumps off-screen, the wrong opening parenthesis is highlighted<br>
(although the jump is to the right place).<br>
<br>
So allowing jump-offscreen and show-paren-mode to coexist will need<br>
more changes than just removing the condition.<br>
</blockquote></div>

--0000000000006472a10576d8742c--




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#32851; Package emacs. Full text available.

Message received at 32851 <at> debbugs.gnu.org:


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 (message from Stefan Guath on Thu, 27 Sep 2018 11:35:06 +0200)
Subject: Re: bug#32851: 26.1.50;
 show-paren-mode disables off-screen-paren-match
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> From: Stefan Guath <stefan@HIDDEN>
> Date: Thu, 27 Sep 2018 11:35:06 +0200
> 
> When show-paren-mode is enabled, the only respected setting for blink-matching-paren is "any other non-nil
> value" which echos matched parens only when they are off-screen. The settings t, 'jump and 'jump-offscreen
> are disabled.
> 
> I can understand why the settings t and 'jump are disregarded since it would just be a redundant functionality
> of show-paren-mode. But I don't understand why the setting 'jump-offscreen is disregarded. I think it's a better
> option than "echo match off screen paren" since i) a jump (i.e. a scroll) gives more context than a one-liner in
> the echo area, and ii) it's very convenient to get a semantic based scroll operation automatically.

Did you try to remove the condition that show-paren-mode is active?
When I try that, I see an unpleasant effect: when blink-matching-paren
jumps off-screen, the wrong opening parenthesis is highlighted
(although the jump is to the right place).

So allowing jump-offscreen and show-paren-mode to coexist will need
more changes than just removing the condition.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#32851; Package emacs. Full text available.

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


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Subject: 26.1.50; show-paren-mode disables off-screen-paren-match
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--000000000000e3b4370576d70efc
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SUMMARY
When show-paren-mode is enabled, the setting (setq blink-matching-paren
'jump-offscreen) is disabled, which is annoying.

DESCRIPTION
When show-paren-mode is enabled, the only respected setting for
blink-matching-paren is "any other non-nil value" which echos matched
parens only when they are off-screen. The settings t, 'jump and
'jump-offscreen are disabled.

I can understand why the settings t and 'jump are disregarded since it
would just be a redundant functionality of show-paren-mode. But I don't
understand why the setting 'jump-offscreen is disregarded. I think it's a
better option than "echo match off screen paren" since i) a jump (i.e. a
scroll) gives more context than a one-liner in the echo area, and ii) it's
very convenient to get a semantic based scroll operation automatically.

--000000000000e3b4370576d70efc
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>SUMMARY<br></div><d=
iv>When show-paren-mode is enabled, the setting (setq blink-matching-paren =
&#39;jump-offscreen) is disabled, which is annoying.<br></div><div><br></di=
v><div>DESCRIPTION</div><div>When show-paren-mode is enabled, the only resp=
ected setting for blink-matching-paren is &quot;any other non-nil value&quo=
t; which echos matched parens only when they are off-screen. The settings t=
, &#39;jump and &#39;jump-offscreen are disabled.<br></div><div><br></div><=
div>I can understand why the settings t and &#39;jump are disregarded since=
 it would just be a redundant functionality of show-paren-mode. But I don&#=
39;t understand why the setting &#39;jump-offscreen is disregarded. I think=
 it&#39;s a better option than &quot;echo match off screen paren&quot; sinc=
e i) a jump (i.e. a scroll) gives more context than a one-liner in the echo=
 area, and ii) it&#39;s very convenient to get a semantic based scroll oper=
ation automatically.<br></div><br></div></div></div>

--000000000000e3b4370576d70efc--




Acknowledgement sent to Stefan Guath <stefan@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#32851; Package emacs. Full text available.
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