Huy Nguyen c603ef0ef2 [ASLayout] Revisit the flattening algorithm (#395)
* Implement tests for the layout flattening process

* Refactor the flattening algorithm
- Remove flattened flag
- No more self check
- Stop traversing a layout tree branch when hits a displaynode node.
- Reuse as many existing ASLayout objects as possible

* Update changelog

* Ceil position values before comparing

* Explain why sublayout elements must be retained
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