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Visibility widget (#20365)

* Visibility widget

This attempts to address the confusion around how to hide a widget subtree.

* Apply review comments

* More clarifications
I
Ian Hickson committed
21f22ed3bae713db9bdd1260dfc5f16c5fae888c
Parent: 6146c0f
Committed by GitHub <noreply@github.com> on 8/10/2018, 1:23:36 AM