message: minifix(GUI): resolve react missing key field warning
  We attach key fields where necessary to make the warnings go away.
  Change-Type: patch
diff: @@ -317,6 +317,7 @@ const Breadcrumbs = styled((props) => {
  _.map(dirs.slice(-MAX_DIR_CRUMBS), (dir, index) => {
  return (
  <rendition.Button
  + key={ dir.fullpath }
  onClick={ () => props.selectFile(dir) }
  plaintext={ true }>
  <rendition.Txt bold={ index === dirs.length - 1 }>
  @@ -427,6 +428,7 @@ class FileSelector extends React.PureComponent {
  items.map((item, index) => {
  return (
  <FileLink { ...item }
  + key={ item.fullpath }
  highlight={ _.get(this.state.highlighted, 'fullpath') === _.get(item, 'fullpath') }
  onClick={ () => this.setState({ highlighted: item }) }
  onDoubleClick={ _.partial(this.selectFile, item) }
  