[RFC][PATCH v4] emacs: Re-implement advance/rewind functions of notmuch-show-mode.

[David Edmondson]

On Mon, 26 Dec 2011 10:49:46 +0000, David Edmondson <dme at dme.org> wrote:
> > > +     ((= start-of-message (point))
> > > +      ;; The cursor is at the start of the current message - move to
> > > +      ;; the previous open message.
> > > +      (notmuch-show-previous-open-message))
> > 
> > This will jump to the beginning of the previous message if I'm at the
> > beginning of a message.  I would expect rewind to show me the end of
> > the previous message in this case.
> 
> That would definitely more closely be the inverse of how advance works,
> but is it the most useful behaviour?

I thought about this a bit more (mostly because I don't want to write
tests for one behaviour and then have to change them - writing tests for
emacs with the current test suite is painful).

If you want to go back a page you can use M-v. The whole point of
binding DEL to something in `notmuch-show-mode' is that it implement
something other than the vanilla behaviour. Simply showing the previous
page (the equivalent of M-v) adds no value.

Hence, I'd like to keep the (jump back a full message) behaviour in the
patch.
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