Paper-tabs Assertion Failed: You modified canPageBack twice in a single render (#980)
Paper-tabs Assertion Failed: You modified canPageBack twice in a single render (#980)

Im getting this error
`Assertion Failed: You modified "canPageBack" twice in a single render`
in mobile chrome which prevents the smoothly transition to hidden tabs.

I tracked it down to `this.fixOffsetIfNeeded();` which is executed everytime the `_selectedTab` change which at least in my use case, it can be changed both programatically (i.e `selected=someProperty`) or by the end user when clicked on a tab or the next, previous arrows.


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