message: also prevent merge/skip on rich text pastes
diff: @@ -980,9 +980,15 @@ 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);
  if (this.state.isRichTextEnabled) {
  - return change.insertFragment(fragment.document);
  + return change
  + .setOperationFlag("skip", false)
  + .setOperationFlag("merge", false)
  + .insertFragment(fragment.document);
  } else {
  - return change.insertText(this.md.serialize(fragment));
  + return change
  + .setOperationFlag("skip", false)
  + .setOperationFlag("merge", false)
  + .insertText(this.md.serialize(fragment));
  }
  }
  case 'text':
  