message: [GUI] chart combobox rounded borders.
diff: @@ -1617,6 +1617,7 @@ QComboBox[cssClass="btn-combo-chart"] {
  border:1px solid #ffffff;
  color: #bababa;
  text-align: right;
  + border-radius: 4px;
  }
  QComboBox[cssClass="btn-combo-chart"]::down-arrow {
  @@ -1633,6 +1634,7 @@ QComboBox[cssClass="btn-combo-chart-selected"] {
  border:1px solid #5c4b7d;
  color: #FFFFFF;
  text-align: right;
  + border-radius: 4px;
  }
  QComboBox[cssClass="btn-combo-chart-selected"]::down-arrow {
  