Hixie dfd821e595 Ignore generation of child if child is unchanged
Also:

 - don't mark a node as from the new generation if it is dirty, since we
   know it still has to be built.

 - establish the rule that you can't call setState() during initState()
   or build().

 - make syncChild() return early for unchanged children.

 - update the tests, including adding a new one.
2015-09-15 13:20:37 -07:00
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