[PATCH] emacs: Fix `notmuch-show-rewind' in the presence of invisible text

[Carl Worth]

> From: David Edmondson <dme at dme.org>
> 
> When determining whether or not to re-align the head of the current
> message with the top of the window, use `count-screen-lines' rather
> than `count-lines' to allow for invisible text in the preceding
> message.

Sounds good to me. Pushed without any additional testing, (though I
would love to eventually have some automated emacs-based testing for
tricky little interaction cases like this.)

Someday.

-Carl
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