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Re: Correct way to implement `pixel-point-and-height-at-unseen-line'?

From: Po Lu
Subject: Re: Correct way to implement `pixel-point-and-height-at-unseen-line'?
Date: Tue, 14 Dec 2021 08:41:06 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.60 (gnu/linux)

Eli Zaretskii <> writes:

> And you didn't describe why do you need
> pixel-point-and-height-at-unseen-line's data in the first place, so
> maybe there's a different solution to whatever you are trying to do
> that doesn't involve such a function.

It's used to find a suitable new start position that's N pixels above
window start, so vscroll can then be set to compensate for the
difference.  For instance, scrolling up by a delta of 1 pixel if vscroll
is already zero will move to such a start position, and set vscroll to
the returned height - 1.


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