openlayers/ol3 — pull request #2960 by bartvde (2014-11-18 18:55:55+00:00)
Title: LayerGroup extent should be used if extent not set on child layer

See the discussion here: https://groups.google.com/d/msg/ol3-dev/USnJCtA0hJU/JHyVnCr4rNUJ

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