RC forgets search results

[xian]

When opening a message from within a search I would expect the 'next message' and 'previous message' buttons to refer to the next and previous search result. Instead they link to the next and previous message in the folder.

After returning to the message list it would be nice to see the search result set again instead of seeing all messages in the current folder.

Possibly connected with #1483858.

[the_glu]

About my patch :

- When you click on a message, the previous/next button switch between search result, and not all mails.
- When you return to the list, the search is memorized

(What is described here in fact x])

[robin]

Thanks, fixed in r976.