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Re: Is there any particular reason `scroll-other-window' is written in C
From: |
Marcin Borkowski |
Subject: |
Re: Is there any particular reason `scroll-other-window' is written in C and not in ELisp? |
Date: |
Tue, 29 Dec 2015 18:37:40 +0100 |
User-agent: |
mu4e 0.9.13; emacs 25.0.50.1 |
On 2015-12-29, at 17:02, Eli Zaretskii <address@hidden> wrote:
>> From: Marcin Borkowski <address@hidden>
>> Date: Tue, 29 Dec 2015 10:32:00 +0100
>
> Because it needs to determine the new window-start which is a
> window-full above or below the current one, without assuming that all
> the lines have the same height in pixels. How do you do that in Lisp?
> (The current implementation simulates display.)
Interesting, though I know too little about Emacs internals to fully
understand your answer. I thought it just does something like
(save-excursion
(other-buffer)
(scroll-up))
Why my (probably naïve) implementation won't work?
>> The reason I'm asking is that C-M-v (and C-M-S-v, for that matter) do
>> the wrong thing if the other window shows a pdf file using pdf-tools.
>> If those commands were written in Elisp, I could not only advise them
>> (which I can, and probably will), but also propose a patch or
>> something.
>
> Sounds like a bug that should be reported. Not sure if it's in core
> Emacs or not, but please do report it with all the necessary details
> to whatever the guilty parties are.
Not Emacs core, you're right. I'll file a bug report.
> Thanks.
Thanks
--
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University