private void unsetBackgroundProperties(String backgroundPropertyKey) {
    PropertiesComponent propertyManager = PropertiesComponent.getInstance();
    String value = propertyManager.getValue("old." + backgroundPropertyKey);
    propertyManager.unsetValue("old." + backgroundPropertyKey);
    if (value != null) {
      propertyManager.setValue(backgroundPropertyKey, value);
    }
    else if (!theme.getBackground().isEmpty()) {
      propertyManager.unsetValue(backgroundPropertyKey);
    }
  }
private void unsetBackgroundProperties(String backgroundPropertyKey)