tobago-core/src/main/java/org/apache/myfaces/tobago/internal/renderkit/renderer/SelectManyListRenderer.java [52:111]:
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  @Override
  protected CssItem[] getComponentCss(final FacesContext facesContext, final T component) {
    final List<SelectItem> items = SelectItemUtils.getItemList(facesContext, component);
    final boolean disabled = !items.iterator().hasNext() || component.isDisabled() || component.isReadonly();

    List<CssItem> cssItems = new ArrayList<>();
    if (disabled) {
      cssItems.add(TobagoClass.DISABLED);
    }
    return cssItems.toArray(new CssItem[0]);
  }

  @Override
  protected void writeAdditionalAttributes(FacesContext facesContext, TobagoResponseWriter writer, T component)
      throws IOException {
    super.writeAdditionalAttributes(facesContext, writer, component);
    writer.writeAttribute(CustomAttributes.FILTER, component.getFilter(), true);
    writer.writeAttribute(CustomAttributes.LOCAL_MENU, component.isLocalMenu());
  }

  @Override
  protected void encodeBeginField(FacesContext facesContext, T component) throws IOException {
    final TobagoResponseWriter writer = getResponseWriter(facesContext);

    final String clientId = component.getClientId(facesContext);
    final String fieldId = component.getFieldId(facesContext);
    final String selectFieldId = clientId + ComponentUtils.SUB_SEPARATOR + "selectField";
    final String filterId = clientId + ComponentUtils.SUB_SEPARATOR + "filter";
    final List<SelectItem> items = SelectItemUtils.getItemList(facesContext, component);
    final boolean disabled = !items.iterator().hasNext() || component.isDisabled() || component.isReadonly();
    final String filter = component.getFilter();
    final boolean expanded = component.isExpanded();
    final String title = HtmlRendererUtils.getTitleFromTipAndMessages(facesContext, component);
    final Integer tabIndex = component.getTabIndex();

    encodeHiddenSelect(facesContext, component, items, clientId, fieldId, disabled);

    writer.startElement(HtmlElements.DIV);
    writer.writeClassAttribute(
        expanded ? BootstrapClass.LIST_GROUP : BootstrapClass.DROPDOWN,
        expanded ? BootstrapClass.borderColor(ComponentUtils.getMaximumSeverity(component)) : null);

    encodeSelectField(facesContext, component,
        clientId, selectFieldId, filterId, filter, disabled, expanded, title, tabIndex);
    encodeOptions(facesContext, component, items, clientId, expanded, disabled);

    writer.endElement(HtmlElements.DIV);
  }

  private void encodeHiddenSelect(
      final FacesContext facesContext, final T component, final List<SelectItem> items,
      final String clientId, final String fieldId, final boolean disabled) throws IOException {
    final TobagoResponseWriter writer = getResponseWriter(facesContext);

    writer.startElement(HtmlElements.SELECT);
    writer.writeIdAttribute(fieldId);
    writer.writeNameAttribute(clientId);
    writer.writeAttribute(HtmlAttributes.DISABLED, disabled);
    writer.writeAttribute(HtmlAttributes.REQUIRED, component.isRequired());
    writer.writeClassAttribute(BootstrapClass.D_NONE);
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tobago-core/src/main/java/org/apache/myfaces/tobago/internal/renderkit/renderer/SelectOneListRenderer.java [51:110]:
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  @Override
  protected CssItem[] getComponentCss(final FacesContext facesContext, final T component) {
    final List<SelectItem> items = SelectItemUtils.getItemList(facesContext, component);
    final boolean disabled = !items.iterator().hasNext() || component.isDisabled() || component.isReadonly();

    List<CssItem> cssItems = new ArrayList<>();
    if (disabled) {
      cssItems.add(TobagoClass.DISABLED);
    }
    return cssItems.toArray(new CssItem[0]);
  }

  @Override
  protected void writeAdditionalAttributes(FacesContext facesContext, TobagoResponseWriter writer, T component)
      throws IOException {
    super.writeAdditionalAttributes(facesContext, writer, component);
    writer.writeAttribute(CustomAttributes.FILTER, component.getFilter(), true);
    writer.writeAttribute(CustomAttributes.LOCAL_MENU, component.isLocalMenu());
  }

  @Override
  protected void encodeBeginField(FacesContext facesContext, T component) throws IOException {
    final TobagoResponseWriter writer = getResponseWriter(facesContext);

    final String clientId = component.getClientId(facesContext);
    final String fieldId = component.getFieldId(facesContext);
    final String selectFieldId = clientId + ComponentUtils.SUB_SEPARATOR + "selectField";
    final String filterId = clientId + ComponentUtils.SUB_SEPARATOR + "filter";
    final List<SelectItem> items = SelectItemUtils.getItemList(facesContext, component);
    final boolean disabled = !items.iterator().hasNext() || component.isDisabled() || component.isReadonly();
    final String filter = component.getFilter();
    final boolean expanded = component.isExpanded();
    final String title = HtmlRendererUtils.getTitleFromTipAndMessages(facesContext, component);
    final Integer tabIndex = component.getTabIndex();

    encodeHiddenSelect(facesContext, component, items, clientId, fieldId, disabled);

    writer.startElement(HtmlElements.DIV);
    writer.writeClassAttribute(
        expanded ? BootstrapClass.LIST_GROUP : BootstrapClass.DROPDOWN,
        expanded ? BootstrapClass.borderColor(ComponentUtils.getMaximumSeverity(component)) : null);

    encodeSelectField(facesContext, component,
        clientId, selectFieldId, filterId, filter, disabled, expanded, title, tabIndex);
    encodeOptions(facesContext, component, items, clientId, expanded, disabled);

    writer.endElement(HtmlElements.DIV);
  }

  private void encodeHiddenSelect(
      final FacesContext facesContext, final T component, final List<SelectItem> items,
      final String clientId, final String fieldId, final boolean disabled) throws IOException {
    final TobagoResponseWriter writer = getResponseWriter(facesContext);

    writer.startElement(HtmlElements.SELECT);
    writer.writeIdAttribute(fieldId);
    writer.writeNameAttribute(clientId);
    writer.writeAttribute(HtmlAttributes.DISABLED, disabled);
    writer.writeAttribute(HtmlAttributes.REQUIRED, component.isRequired());
    writer.writeClassAttribute(BootstrapClass.D_NONE);
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