function nodeIsRenderedByOtherInstance(container) {
	  var rootEl = getReactRootElementInContainer(container);
	  return !!(rootEl && isReactNode(rootEl) && !ReactDOMComponentTree.getInstanceFromNode(rootEl));
	}
True if the supplied DOM node is a React DOM element and
it has been rendered by another copy of React.

@param {?DOMElement} node The candidate DOM node.
@return {boolean} True if the DOM has been rendered by another copy of React
@internal