message: prevent cider history overlapping with slate composer history
diff: @@ -235,7 +235,7 @@ export default class SendMessageComposer extends React.Component {
  const parts = this._restoreStoredEditorState(partCreator) || [];
  this.model = new EditorModel(parts, partCreator);
  this.dispatcherRef = dis.register(this.onAction);
  - this.sendHistoryManager = new SendHistoryManager(this.props.room.roomId, 'mx_slate_composer_history_');
  + this.sendHistoryManager = new SendHistoryManager(this.props.room.roomId, 'mx_cider_composer_history_');
  }
  get _editorStateKey() {
  