bug#56393: Actually fix the long lines display bug

[Gerd Möllmann]

On 2022-07-07,, at 16:10 , Eli Zaretskii <eliz@gnu.org> wrote:

Yes, this should test window_end_valid before using window_end_pos.
An alternative could be window-start point plus some estimation of the
window's text, perhaps?

Actually, we could be more accurate: we could use move_it_to,
similarly to what pos_visible_p does when passed -1 as the position.

That's a possibility, indeed.

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