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Add SizedBox.square() constructor (#84041)

* Add SizedBox.square() constructor

* Fix comment and move test case to the right file

* Add missing import statement
P
Pedro Massango committed
3193285c7d169e2d7b4b1e787d18fbd5371fe82c
Parent: 02b46b0
Committed by GitHub <noreply@github.com> on 6/10/2021, 6:49:40 PM