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From: Steven Allen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: luangruo@yahoo.com, 72323@debbugs.gnu.org, storm@cua.dk
Subject: bug#72323: 31.0.50; line-move unconditionally resets vscroll to 0
Date: Sun, 18 Aug 2024 15:17:48 -0700	[thread overview]
Message-ID: <871q2l5vcj.fsf@stebalien.com> (raw)
In-Reply-To: <86r0aly7s5.fsf@gnu.org>

Eli Zaretskii <eliz@gnu.org> writes:

>> > I disagree.  When point moves to another screen line without moving
>> > window-start, vscroll may or may not be valid.  Whether it is depends
>> > on the details of what is on display.
>> 
>> Can you give me an example example where moving point invalidates
>> vscroll (except when point would move partially or fully off screen)?
>
> Why isn't the one example I gave enough?
>
> The code in question doesn't know whether this is or isn't the case,
> at least not in all cases and not without a lot of tedious layout
> calculations.  Whether the current line will be fully visible is only
> known after the window is redisplayed.  At which time we also check
> that we didn't enter the scroll margins and other conditions that
> require to scroll the window.  Keeping the vscroll would make all this
> much more complicated, so we play it safe.

I just wanted to confirm that the issue is specifically about the being
fully visible and not something else I'm missing. If that's the case,
I'll see if I can hack something up for my own use and, if usable, see
if it's possible to integrate into pixel-scroll-precision-mode. But
it'll have to be an advice as line-move is called all over the place.

It really sounds like you just don't want to mess with this function
which is a reasonable stance as the maintainer. But it was really hard
to tell if there was something I was fundamentally misunderstanding or
if you were just being cautious and not wanting to touch a complex piece
of machinery if it's working "well enough".





  reply	other threads:[~2024-08-18 22:17 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-07-27 17:57 bug#72323: 31.0.50; line-move unconditionally resets vscroll to 0 Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-27 18:11 ` Eli Zaretskii
2024-07-27 20:10   ` Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-28  4:50     ` Eli Zaretskii
2024-07-28 20:07       ` Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-28 20:10         ` Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-29 11:14           ` Eli Zaretskii
2024-07-29 11:12         ` Eli Zaretskii
2024-07-29 14:30           ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-08-18 17:42             ` Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-08-18 17:38           ` Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-08-18 18:21             ` Eli Zaretskii
2024-08-18 18:40               ` Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-08-18 19:01                 ` Eli Zaretskii
2024-08-18 22:17                   ` Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2024-08-19 11:06                     ` Eli Zaretskii
2024-08-19 17:30                       ` Steven Allen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-09-30  0:51                         ` Stefan Kangas

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