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Update Semantics for SingleChildScrollViews (#12376)

* Update Semantics for SingleChildScrollViews

* refactor

* review feedback

* added assert and comments

* doc
M
Michael Goderbauer committed
f07170b45ba9df79501130cea7ea4b05fa86a29a
Parent: 51e4e9f
Committed by GitHub <noreply@github.com> on 10/11/2017, 8:07:19 PM