ipython/ipython — pull request #2808 by minrk (2013-01-18 22:17:11+00:00)
Title: improve patience for slow Hub in client tests

adds a first step in `_wait_for_idle`, where it waits for all tasks to arrive before waiting for no tasks to be running. On a super slow machine, it was possible for `_wait_for_idle` to return prematurely, before tasks had even started.

ought to close #2807