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HPM2's iframe should resize itself on resize events

HPM2's iframe should resize itself on resize events

As of right now, the iframe only changes its height when first rendered and on input error validation.

This behavior should also be called when the user triggers a resize event of the browser (zoom or manual resize). 

CSS alone is not enough to make an iframe responsive, and therefore there should be a way for the developpers who integrate the iframe to either receive a message about the measured height of the iframe's dom, or that the iframe handles it's own measuring and resizing by itself.

While it is understandable that the will not allow cross domain communication for security purpose, it should use its already eaxisting sizing function to make itself responsive.