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Subject: bug#48754: previous-line on large lines or images travels two lines sometimes
Resent-From: Radon Rosborough <radon.neon@HIDDEN>
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Date: Sun, 30 May 2021 14:54:34 -0700
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I've encountered some puzzling behavior related to
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=48170.

Specifically, running under emacs -Q commit
d6dc66053d846b6fc041889b4d0f383c8dac4da3 of 2021-05-30 on GNOME, if I load
up https://github.com/raxod502/bug48170-repro, then `next-line' navigates 1
line down, but `previous-line' navigates 2 lines up!

Any ideas about what might be causing that?

Best,
Radon

--000000000000a47d2905c393291f
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<div dir=3D"ltr">I&#39;ve encountered some puzzling behavior related to <a =
href=3D"https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D48170">https://debb=
ugs.gnu.org/cgi/bugreport.cgi?bug=3D48170</a>.<div><br></div><div>Specifica=
lly, running under emacs -Q commit d6dc66053d846b6fc041889b4d0f383c8dac4da3=
 of 2021-05-30 on GNOME, if I load up=C2=A0<a href=3D"https://github.com/ra=
xod502/bug48170-repro">https://github.com/raxod502/bug48170-repro</a>, then=
 `next-line&#39; navigates 1 line down, but `previous-line&#39; navigates 2=
 lines up!</div><div><br></div><div>Any ideas about what might be causing t=
hat?</div><div><br></div><div>Best,</div><div>Radon</div></div>

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To: Radon Rosborough <radon.neon@HIDDEN>
Subject: bug#48754: Acknowledgement (previous-line on large lines or
 images travels two lines sometimes)
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Subject: bug#48754: previous-line on large lines or images travels two lines sometimes
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Mon, 31 May 2021 18:26:27 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
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 (message from Radon Rosborough on Sun, 30 May 2021 14:54:34 -0700)
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> From: Radon Rosborough <radon.neon@HIDDEN>
> Date: Sun, 30 May 2021 14:54:34 -0700
> 
> I've encountered some puzzling behavior related to https://debbugs.gnu.org/cgi/bugreport.cgi?bug=48170.
> 
> Specifically, running under emacs -Q commit d6dc66053d846b6fc041889b4d0f383c8dac4da3 of
> 2021-05-30 on GNOME, if I load up https://github.com/raxod502/bug48170-repro, then `next-line' navigates 1
> line down, but `previous-line' navigates 2 lines up!

I cannot reproduce this.  With the current master, both C-n and C-p
move by one screen line.

P.S. I only downloaded code.el, and it seems identical to the one in
the previous bug.  the images seem also identical, so I reused the
images from the previous bug.  Did any of them change?  Judging by the
time stamps, they didn't.

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Subject: bug#48754: previous-line on large lines or images travels two lines sometimes
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Date: Sat, 5 Jun 2021 12:43:11 -0700
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--000000000000d748df05c40a06a0
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I've found that this problem appears to depend on the window size. With the
default window size, everything works as expected. But, when I maximize the
window to fill my screen, C-p moves two lines up. Does that happen for you?
If not, I can experiment to find more precise conditions.

code.el is the same as the previous report, yes.

--000000000000d748df05c40a06a0
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<div dir=3D"ltr">I&#39;ve found that this problem appears to depend on the =
window size. With the default window size, everything works as expected. Bu=
t, when I maximize the window to fill my screen, C-p moves two lines up. Do=
es that happen for you? If not, I can experiment to find more precise condi=
tions.<div><br></div><div>code.el is the same as the previous report, yes.<=
/div></div>

--000000000000d748df05c40a06a0--

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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Radon Rosborough <radon.neon@HIDDEN>
>> Date: Sun, 30 May 2021 14:54:34 -0700
>>
>> I've encountered some puzzling behavior related to https://debbugs.gnu.org/cgi/bugreport.cgi?bug=48170.
>>
>> Specifically, running under emacs -Q commit d6dc66053d846b6fc041889b4d0f383c8dac4da3 of
>> 2021-05-30 on GNOME, if I load up https://github.com/raxod502/bug48170-repro, then `next-line' navigates 1
>> line down, but `previous-line' navigates 2 lines up!
>
> I cannot reproduce this.  With the current master, both C-n and C-p
> move by one screen line.

I can reproduce this bug on current master.

Here's the git clone command for the sake of convenience:

    git clone https://github.com/raxod502/bug48170-repro.git

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