bug#13429: 24.2; `window-end' returns point after last point in window

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> For example, when a given window is displaying a buffer that overflows
>> the window, a call to `window-end' will return the greatest visible
>> position **plus one**.
>
> This is what is meant by "position at which display ends".
> Suggestions for how to describe that better are welcome.

I've added an extra sentence to the doc string in Emacs 28 to try to
clarify this.

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