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Re: Misery with undo. Help, please!

From: Stefan Monnier
Subject: Re: Misery with undo. Help, please!
Date: Thu, 23 Oct 2008 14:33:03 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

>> > [*] Actually, it inserts an extra, spurious, nil too, or I've badly
>> > misunderstood something.  This seems to be a bug in the macro `push'.
>> No, it isn't.  The command loop automatically inserts an undo boundary.
>> You should use ielm for your experiments.
> Ah, thanks!  How come I didn't know about ielm?

Indeed, how come?

> The problem, with a buffer-undo-list of (nil 6 nil ......) is that
> primitive-undo piles nothing onto it, merely moving point to 6.
> buffer-undo-list thus remains unaltered after C-_.  This is a bug.

In itself maybe it's not a bug (tho it should probably record some
other point-motion entry), but it probably introduces problem
w.r.t. undo-equiv-table.  Can someone try and figure out why C-_ doesn't
record a point-motion entry on the buffer-undo-list?


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