bug#13306: clarification

[Eli Zaretskii <eliz@gnu.org>]

> From: Mark Lillibridge <mdl@alum.mit.edu>
> Date: Sat, 29 Dec 2012 15:02:36 -0800
> 
> 
>     In case it wasn't clear from the last message, occurs does not work
> sanely with Rmail buffers currently even in version 24.2.  It takes you
> to the occurrence point but there is no way to narrow the buffer so you
> can do things like forward the found message.
> 
>     Perhaps a way to narrow a widened Rmail buffer around point would be
> a useful independent function.  I'm wondering if such a function called
> from the right occurs mode hook (assuming it exists) would suffice to
> provide the functionality I'm asking for here.
> 
> - Mark
> PS, note that both grep and the proposed occurs search the raw mbox file
> not the results of decoding the messages; if someone wanted to go for
> extra awesomeness, they might try and make an special Rmail search
> command that produces an occurs buffer but only searches the decoded
> messages (e.g., ignore nontext parts, work on base 64/printable
> representations correctly).  This would be substantially slower, but
> would avoid a lot of false positives.

Mairix solves all this, since the results of the search are
_messages_, not just lines of text, and these results are presented to
Rmail that decodes and displays them as usual.  Try it.