message: Always use message `body` when quoting
  (not formatted_body)
  This is because draft-js has regressed with a bug that causes some entities to not exist within a given ContentState - see vector-im/riot-web#4756
diff: @@ -279,10 +279,13 @@ export default class MessageComposerInput extends React.Component {
  }
  break;
  case 'quote': {
  - let {body, formatted_body} = payload.event.getContent();
  - formatted_body = formatted_body || escape(body);
  - if (formatted_body) {
  - let content = RichText.htmlToContentState(`<blockquote>${formatted_body}</blockquote>`);
  + let {body} = payload.event.getContent();
  + /// XXX: Not doing rich-text quoting from formatted-body because draft-js
  + /// has regressed such that when links are quoted, errors are thrown. See
  + /// https://github.com/vector-im/riot-web/issues/4756.
  + body = escape(body);
  + if (body) {
  + let content = RichText.htmlToContentState(`<blockquote>${body}</blockquote>`);
  if (!this.state.isRichtextEnabled) {
  content = ContentState.createFromText(RichText.stateToMarkdown(content));
  }
  