Re: move_it_vertically_backward question

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

> We have code in the display engine that does this in several places.
> For example, look at what we do when we recenter the window in
> redisplay_window.  We could factor that code out of there, put it in a
> separate function, and teach window-text-pixel-size to find the FROM
> position using that new function.  Then the value of the TO argument
> for window-text-pixel-size is of course well known, and you could run
> the rest of the function to provide you with the pixel dimensions of
> the text in-between.
>
> Would that fit the bill?

I think it would, with the addition of a way to specify "the end of the
visual line preceeding window start" as the TO argument.  That is
because window start could be inside a screen line, causing its height
to be taken into account when `window-text-pixel-size' calculates
height.

Thanks.