Michael Zuccarino 9588692361 Clean up timing of layout tree flattening/ copying of unflattened tree for Weaver (#1157)
* Simpler Huy fix for more efficient delayed flattening of the layout tree

* Nit

* Remove pbx changes

* Update CHANGELOG.md

* Add note about change in timing of _flattenedLayout capture
2018-10-03 14:49:15 -07:00
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2017-02-26 18:14:13 -08:00