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fix examples/layers/widgets/gestures.dart (#11138)

* fix examples/layers/widgets/gestures.dart

* use a list of colors to avoid error prone in elseif

* address review comments

* add tests

* keep index to lower complexity

* address review comments
A
Alexandre Ardhuin committed
f2809423cd2a5a211361a01bdc2e0331940d9ec5
Parent: 9275083
Committed by GitHub <noreply@github.com> on 7/13/2017, 7:16:03 AM