It's a needless wrapper, nowadays. Originally, ->over was added
on experimental basis to optimize for /$INBOX/ where Xapian
->search is slower on gigantic (LKML-sized) inboxes.
Nowadays with extindex, ->over is here to stay given NNTP and
IMAP both benefit from it. So reduce the interpreter stack
overhead and just access ->over directly.
lxs->recent was never used outside of tests, anyways.
And while we're in the area, avoid needlessly bumping the
refcount of $ctx->{ibx} in View::paginate_recent.