New base property causes _srcChanged() to be invoked before this.src is set

[jeffposnick]

4bc8531 introduced a race condition in which the new base property causes the _srcChanged() observer to be called before the src property is set.

Inside _srcChanged(), the check for this.src ends up being evaluated to false even if src is set on the element, since it hasn't been copied over to this yet.

This breaks doc pages when the src is meant to be something other than the parent directory's name with the .html suffix.

[atotic]

good one, working on it

[jeffposnick]

@atotic, the bug was re-added in 0f39606

Can you please cut a new release without using _srcObserver for base? Or find another way of achieving the same effect that doesn't have the same race condition?

This is preventing https://github.com/PolymerElements/platinum-sw from using the current release of <iron-component-page>. CC: @addyosmani @wibblymat

[atotic]

fixed again in 7e58148