Add support for imenu

[Damien Cassou]

Please find attached a patch adding imenu support in both search 
and show modes.

-- 
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm." --Winston Churchill
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0001-Add-imenu-support-in-notmuch-show-and-notmuch-search.patch
Type: text/x-patch
Size: 3800 bytes
Desc: not available
URL: <http://notmuchmail.org/pipermail/notmuch/attachments/20170523/88141b66/attachment-0001.bin>