[PATCH] emacs: Fix i-search to open up invisible citations as necessary

[Carl Worth]

On Fri, 23 Apr 2010 18:39:33 +0100, David Edmondson <dme at dme.org> wrote:
> Add an `isearch-open-invisible' property to the overlays used to hide
> citations and signatures, together with an appropriate function to
> leave the invisible text visible should that be required.

This is a fantastic feature, David. Thanks! This is pushed.

I knew emacs could do this kind of thing, and I had even tried to
implement it once, but I hadn't succeeded for some reason.

Next, I wonder if we shouldn't do something similar for the search
view. It might be quite handy if all authors and all unique subjects for
a thread were made available for i-search in the buffer, but hidden by
default and expanded as needed like this. What do you think?

-Carl
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