create index concurrently blocks on transactions in other databases

steps to reproduce:
session1: connect using user1 to database1.
session2: connect using user2 to database2.
session1: create table x ( y int);
session2: begin;
session1: create index concurrently q on x(y);
it hangs.
session2: rollback/commit;
session1: finishes.

i dont really see why this would be neccessary - i understand that we
need to wait for transactions in the same db, but waiting for
transaction in another database?

i tested it on 8.2.4 and 8.3devel from cvs-head, fetched 3 days ago.

depesz

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