@NotNull
  public SdkListModel buildModel() {
    ImmutableList.Builder<SdkListItem> newModel = ImmutableList.builder();


    if (myNoneSdkItem != null) {
      newModel.add(myNoneSdkItem);
    }
    if (myProjectSdkItem != null) {
      Sdk projectSdk = mySdkModel.getProjectSdk();
      if (projectSdk == null || mySdkFilter.value(projectSdk)) {
        newModel.add(myProjectSdkItem);
      }
    }
    if (myInvalidItem != null) {
      newModel.add(myInvalidItem);
    }

    newModel.addAll(myReferenceItems);

    newModel.addAll(myHead);

    ImmutableList<ActionItem> subItems = ImmutableList.<ActionItem>builder()
      .addAll(myDownloadActions)
      .addAll(myAddActions)
      .build();

    if (subItems.size() > 3 && !newModel.build().isEmpty()) {
      newModel.add(new GroupItem(AllIcons.General.Add, ProjectBundle.message("combobox.item.add.sdk"), subItems));
    }
    else {
      newModel.addAll(subItems);
    }

    for (SuggestedItem item : mySuggestions) {
      if (!isApplicableSuggestedItem(item)) continue;
      newModel.add(item);
    }

    return new SdkListModel(myIsSdkDetectorInProgress, newModel.build(), () -> mySdkModel.getProjectSdk());
  }
@NotNull
  public SdkListModel buildModel()