hunk.code_window:         this.onHide = this.onHide.bind(this);
           this.state = {
               serverError: ''
           };
       }
  
hunk.labels: keep keep add keep keep keep
hunk.after_edit:             header: props.channel.header,
  
hunk.file_path: web/react/components/edit_channel_header_modal.jsx
hunk.type: add