akka/akka — pull request #1021 by rkuhn (2013-01-12 20:15:54+00:00)
Title: single-shot timers are not always cancelled after cancel(), see #2903

- if the timer expired before cancel(), then isCancelled shall not
return true
- recurring timers are not changed, because there isExpired does not
really make sense

- [ ] backport to 2.1