add MutationObserver to accordion to trigger setChildContentHeight when children change #947
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EuiAccordion does not update height when children internal state changes. I updated the AccordionGrow example to demonstrate. When the counter is modified inside the sub-component than EuiAccordion's componentDidUpdate never gets called because none of the props passed to children changed.
This PR adds a MutationObserver to update height any time the children DOM tree changes.