hunk.code_window:         updateChannelHeader(
               this.props.channel.id,
               this.state.header,
               () => {
                   this.setState({serverError: ''});
                   this.onHide();
               },
               (err) => {
                   if (err.id === 'api.context.invalid_param.app_error') {
                       this.setState({serverError: this.props.intl.formatMessage(holders.error)});
  
hunk.labels: keep keep keep keep keep replace keep keep keep keep keep
hunk.after_edit:                 this.setState({serverError: '', submitted: false});
  
hunk.file_path: webapp/components/edit_channel_header_modal.jsx
hunk.type: replace