Re: move_it_vertically_backward question

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: emacs-devel@gnu.org
> Date: Thu, 16 Dec 2021 17:25:10 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Or maybe I misunderstand what you mean by "window start could be
> > inside a screen line".  Do you mean the window start is not at the
> > leftmost character/display element shown on that screen line?
> 
> Yes.
> 
> > When does that happen?
> 
> It happens in Info buffers, at the very least.  I don't know why that
> is, but it happens.

I guess that's because of display and/or overlay strings at the
beginning of the node or something.

We should provide a way for window-text-pixel-size to stop at the
visual beginning of a line, but I'm not sure the right way of saying
that is specifying the buffer position of the previous line: there
could be a display/overlay string there as well, or somesuch.

So are you going to work on extending window-text-pixel-size like
this, and if so, do you need my help?

Thanks.