message: mention preserving ordering in comment
diff: @@ -143,7 +143,7 @@ module.exports = React.createClass({
  if (this.props.showUrlPreview && !this.state.links.length) {
  var links = this.findLinks(this.refs.content.children);
  if (links.length) {
  - // de-dup the links
  + // de-dup the links (but preserve ordering)
  const seen = new Set();
  links = links.filter((link) => {
  if (seen.has(link)) return false;
  