Still trying to access the list of selected docs in sections :

the action category for my button is

CURRENT_SELECTION_SECTIONS_LIST

the “Selection is not empty” has been replaced by a custom EL

#{documentsListsManager.isWorkingListEmpty("CURRENT_SELECTION_SECTIONS") == false}

This works but Seam.GetSelectedDocuments is useless : i have to contribute a new, not very original, operation in Nuxeo IDE

@Operation(id=GetSectionSelectedDocuments.ID, category=Constants.CAT_FETCH, requires=Constants.SEAM_CONTEXT, label="GetSectionSelectedDocuments", description="")
public class GetSectionSelectedDocuments {

    public static final String ID = "Seam.GetSectionSelectedDocuments";

    protected @Context OperationContext ctx;

    @OperationMethod
    public DocumentModelList run() throws Exception {
        List<DocumentModel> res =
            OperationHelper.getDocumentListManager().getWorkingList(
                            DocumentsListsManager.CURRENT_DOCUMENT_SECTION_SELECTION);
                    return new DocumentModelListImpl(res);
    }   

}

But I meet the following error: could not access: DocumentsListsManager (?)