Adam Barth 0327141c37 Prepare to make RenderObjectElement buildable
This patch prepares us to pass a BuildContext to RenderObjectWidgets, which
will make it possible to rebuild RenderObjectElements:

 * Delay creation of the render object until mount(). That will let us pass
   `this` to createRenderObject and have the inherited elements be initialized.

 * Cleanup widgets that take builder closures to prepare for their
   RenderObjectElement to be rebuilt more often.

 * Add a test for the interaction between inherited widgets and
   MixedViewport.

Related to #2598
2016-03-10 20:18:37 -08:00
..
2016-02-11 00:06:23 -08:00
2016-02-11 00:06:23 -08:00
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