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Re: (Not) scrolling past the end of a buffer

From: Stefan Monnier
Subject: Re: (Not) scrolling past the end of a buffer
Date: Tue, 23 Oct 2012 12:25:43 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2.50 (gnu/linux)

>   (when (and window-bottom-mode
>              (equal (point-max)
>                     (window-end nil t)))
>     (save-excursion
>       (goto-char (point-max))
>       (recenter -1)))

I guess it would be useful for window-end (or some other function) to
return not just `point-max' when the EOB is displayed, but additionally
indicate where that EOB is displayed (so you can avoid calling
`recenter' if EOB is already at the bottom).

> My problem is that I do not have a place where I can actually put this.

Yup.  I think a good place would be a new `after-redisplay-functions'.
Those functions would be called with one argument (the redisplayed
window) right after rebuilding the glyph matrix of a window (and only
if that matrix has changed).

I believe this hook shouldn't be too difficult to add.

A related hook would be `before-redisplay-functions' which I'd also like
to see added.  This one is a bit trickier, because we don't want to call
it for every existing window, but only for those which actually require
a redisplay.  I would *really* like to see such a hook (reveal-mode
could use it, the region-highlighting code could use it).


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