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bug#12170: save-excursion fails boundary case with recenter

From: Stefan Monnier
Subject: bug#12170: save-excursion fails boundary case with recenter
Date: Fri, 10 Aug 2012 12:18:08 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux)

> But I don't have the slightest idea how calling
>        (set-window-start (selected-window) ,start t)
> would remedy this.  Eli will soon teach us a lesson here.

The redisplay tries to make sure (window-)point is visible, which can
either be done by changing (window-)point or by changing window-start.

The first happens when you use a scrolling operation (which sets
window-start), the other happens in response to normal navigation in
the buffer.

Knowing which to do when is not obvious, but IIUC if window-start has
not been changed, then the redisplay assumes that it is free to change
(window-)point, whereas otherwise it will assume that it should not
change (window-)point but can instead change window-start.


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