complaint: vc-annotate finishes in orig buffer now

[Thien-Thi Nguyen <ttn@gnu.org>]

it used to finish in the annotation buffer,
which made using P, N and J (browsing commands)
pleasantly easy.

this means you have to switch back to the annotation buffer
to run those commands, which themselves finish outside
that buffer (since they call `vc-annotate'), the end result
being constant switching required to browse (not pleasant).

a related complaint is that now vc-annotate creates a new
window now, whereas before it did not.

ideally (as was supported previously), i would like to:

   C-x v g       ;; switch to annotation buffer
                 ;; using the original buffer's window
                 ;; and not disturbing any other windows

   P             ;; display previous revision, still
                 ;; using the original buffer's window
                 ;; and not disturbing any other windows

that is, while browsing annotations, i don't mind NOT
seeing the original buffer -- its contents are (for the
most part) in the annotation buffer, anyway.

could we revert to the previous (pleasant) behavior?

thi