message: Fix formatting buttons not marking the composer as modified
diff: @@ -563,6 +563,7 @@ export default class BasicMessageEditor extends React.Component {
  return;
  }
  this.historyManager.ensureLastChangesPushed(this.props.model);
  + this._modifiedFlag = true;
  switch (action) {
  case "bold":
  toggleInlineFormat(range, "**");
  