avoid calling attached multiple times

PolymerElements / iron-resizable-behavior

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avoid calling attached multiple times #30

Closed valdrinkoshi closed 7 years ago

valdrinkoshi commented 7 years ago

attached might be called twice for elements that implement IronResizableBehavior on Chrome. This PR ensures we invoke again only _requestResizeNotifications instead of attached.

cdata commented 7 years ago

LGTM 👍