details {
  padding: 0.5em 0;

  & > div {
    padding-left: 20px;
    border-left: 1px solid @control-bg;
  }

  summary:focus {
    outline: none;
  }

  summary {
    cursor: pointer;
    display: block;
  }
}

.no-details {
  details {
    summary:before {
      content: '► ';
    }

    &.open {
      summary:before {
        content: '▼ ';
      }
    }
  }
}

details {
  padding: 0.5em 0;

  & > div {
    padding-left: 20px;
    border-left: 1px solid @control-bg;
  }

  summary:focus {
    outline: none;
  }

  summary {
    cursor: pointer;
    display: block;
  }
}

.no-details {
  details {
    summary:before {
      content: '► ';
    }

    &.open > summary:before {
      content: '▼ ';
    }
  }
}

Fix open icon for inner details icon of inner details also change to open. this fixes this issue
Fix open icon for inner details
icon of inner details also change to open. this fixes this issue
