From: Michael Welsh Duggan <mwd@md5i.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: Po Lu <luangruo@yahoo.com>, emacs-devel@gnu.org
Subject: Re: Redisplay resets vscroll when window start changes
Date: Tue, 16 Nov 2021 12:12:57 -0500 [thread overview]
Message-ID: <875yssufhf.fsf@md5i.com> (raw)
In-Reply-To: <83mtm41afl.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 16 Nov 2021 15:45:18 +0200")
[-- Attachment #1: Type: text/plain, Size: 851 bytes --]
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Po Lu <luangruo@yahoo.com>
>> Cc: emacs-devel@gnu.org
>> Date: Tue, 16 Nov 2021 21:38:57 +0800
>>
>> Eli Zaretskii <eliz@gnu.org> writes:
>>
>> > If you are moving to another line, how would it make sense to leave
>> > vscroll alone? Or what am I missing?
>>
>> Basically, if someone has the following content in a window:
>>
>> AAAA
>> BBBB
>> CCCC
>> DDDD
>> EEEE
>> FFFF
>> GGGG
>> HHHH
>>
>> And point is on the first "G", while vscroll is set so that part of
>> "AAAA" is obscured, he will expect moving up so that point is on the
>> first "F" to not reset the vscroll.
>
> Moving up pixelwise? that should gradually show more and more of AAAA
> with each pixel movement. How is vscroll involved here?
>
> Or are you talking about some other kind of "moving up?
Given the following buffer:
[-- Attachment #2: Screenshot from 2021-11-16 12-06-46.png --]
[-- Type: image/png, Size: 7622 bytes --]
[-- Attachment #3: Type: text/plain, Size: 44 bytes --]
If I type `C-x C-e` at point, I get this:
[-- Attachment #4: Screenshot from 2021-11-16 12-07-41.png --]
[-- Type: image/png, Size: 7608 bytes --]
[-- Attachment #5: Type: text/plain, Size: 52 bytes --]
At this point, if I type, say, `C-n', I get this:
[-- Attachment #6: Screenshot from 2021-11-16 12-08-51.png --]
[-- Type: image/png, Size: 7488 bytes --]
[-- Attachment #7: Type: text/plain, Size: 361 bytes --]
As you can see, the vscroll has reset, despite simply doing
cursor-movement within the visible reason. This is the behavior that I
believe Po Lu is complaining about. Why should cursor movement that
wouldn't cause a scrolling event under normal circumstances cause one
when vertical fractional scrolling is present?
--
Michael Welsh Duggan
(md5i@md5i.com)
next prev parent reply other threads:[~2021-11-16 17:12 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87k0h9pp7t.fsf.ref@yahoo.com>
2021-11-15 12:39 ` Redisplay resets vscroll when window start changes Po Lu
2021-11-15 12:44 ` Po Lu
2021-11-15 14:18 ` Eli Zaretskii
2021-11-16 0:02 ` Po Lu
2021-11-16 12:51 ` Eli Zaretskii
2021-11-16 12:54 ` Po Lu
2021-11-16 13:01 ` Po Lu
2021-11-16 13:34 ` Eli Zaretskii
2021-11-16 13:38 ` Po Lu
2021-11-16 13:45 ` Eli Zaretskii
2021-11-16 17:12 ` Michael Welsh Duggan [this message]
2021-11-16 18:31 ` Eli Zaretskii
2021-11-17 3:24 ` Stefan Monnier
2021-11-17 13:34 ` Eli Zaretskii
2021-11-17 0:26 ` Po Lu
2021-11-17 3:31 ` Eli Zaretskii
2021-11-17 3:40 ` Stefan Monnier
2021-11-17 13:40 ` Eli Zaretskii
2021-11-17 20:40 ` Stefan Monnier
2021-11-18 6:36 ` Eli Zaretskii
2021-11-19 3:17 ` Stefan Monnier
2021-11-19 7:13 ` Eli Zaretskii
2021-11-19 18:07 ` Stefan Monnier
2021-11-19 18:43 ` Eli Zaretskii
2021-11-17 4:31 ` Po Lu
2021-11-17 7:45 ` Eli Zaretskii
2021-11-17 0:21 ` Po Lu
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