Like the Stream Subject lists, Private messages are now shown
when the user clicks on the "Private message" link. User can drill in
to get more than 5 conversations. Selecting PMs from the user or group
PM lists on the right sidebar also opens the list & highlights the
selected conversation.
[Edited by tabbott@mit.edu to fix some small bugs.]
It's been very buggy for a while, has limited usefulness compared with
unread counts, and profiling over the weekend indicates that it's very
slow.
(imported from commit 716fe47f2bbec1bd8a6e4d265ded5c64efe2ad5c)