openlayers/ol3 — pull request #1251 by tschaub (2013-11-07 17:36:11+00:00)
Title: Only call expireTiles_ if already rendered

See the issue described on the mailing list: https://groups.google.com/d/msg/ol3-dev/k7Mj1knrgpM/sMu4fqKE3TQJ