We missed this because Flow wasn't being run properly on Travis but now that it is, it's clear that #7716 introduced a bunch of new Flow failures. Most of these shouldn't be too bad and I like to say "you break it you buy it" so this one is for you @Aweary :)

There were a couple other pre-existing Flow issues that @vjeux is going to fix, so mostly this should just be the TestRenderer issues.

} else if (node.parentNode !== parentNode) {
    node.inject(parentNode);
  }
}
const ContainerMixin = assign({}, ReactMultiChild, {
  /**
   * Moves a child component to the supplied index.
   *
   * @param {ReactComponent} child Component to move.
   * @param {number} toIndex Destination index of the element.
   * @protected
   */
  moveChild: function(child, afterNode, toIndex, lastIndex) {
    const childNode = child._mountImage;
    injectAfter(this.node, afterNode, childNode);
  },
  /**
   * Creates a child component.
   *
   * @param {ReactComponent} child Component to create.
   * @param {object} childNode ART node to insert.
   * @protected
   */
  createChild: function(child, afterNode, childNode) {
    child._mountImage = childNode;
    injectAfter(this.node, afterNode, childNode);
  },
  /**
   * Removes a child component.
   *