message: workaround to prevent Slate getting too empty when undoing RT pastes
diff: @@ -983,8 +983,9 @@ export default class MessageComposerInput extends React.Component {
  // that we will silently discard nested blocks (e.g. nested lists) :(
  const fragment = this.html.deserialize(transfer.html);
  return change
  - .setOperationFlag("skip", false)
  - .setOperationFlag("merge", false)
  + // XXX: this somehow makes Slate barf on undo and get too empty and break entirely
  + // .setOperationFlag("skip", false)
  + // .setOperationFlag("merge", false)
  .insertFragment(fragment.document);
  } else {
  // in MD mode we don't want the rich content pasted as the magic was annoying people so paste plain
  