Program: 129568
Project: 129568
Buggy source:
public void renameFolder(ERepositoryObjectType type,IPath path,String label) throws PersistenceException {
  IProject fsProject=ResourceModelUtils.getProject(getRepositoryContext().getProject());
  String completePath=ERepositoryObjectType.getFolderName(type) + IPath.SEPARATOR + path.toString();
  IFolder folder=ResourceUtils.getFolder(fsProject,completePath,false);
  IPath targetPath=new Path(label);
  getFolderHelper(getRepositoryContext().getProject().getEmfProject()).renameFolder(completePath,label);
  xmiResourceManager.saveResource(getRepositoryContext().getProject().getEmfProject().eResource());
  if (folder.exists()) {
    ResourceUtils.moveResource(folder,targetPath);
  }
}

Fixed version (ground truth):
public void renameFolder(ERepositoryObjectType type,IPath sourcePath,String label) throws PersistenceException {
  IPath targetPath=sourcePath.removeLastSegments(1);
  Project project=getRepositoryContext().getProject();
  IProject fsProject=ResourceModelUtils.getProject(project);
  String completeOldPath=ERepositoryObjectType.getFolderName(type) + IPath.SEPARATOR + sourcePath.toPortableString();
  String completeNewPath;
  if (targetPath.isEmpty()) {
    completeNewPath=ERepositoryObjectType.getFolderName(type) + IPath.SEPARATOR + label;
  }
 else {
    completeNewPath=ERepositoryObjectType.getFolderName(type) + IPath.SEPARATOR + targetPath.toString()+ IPath.SEPARATOR+ label;
  }
  if (completeNewPath.equals(completeOldPath)) {
    return;
  }
  IFolder folder=ResourceUtils.getFolder(fsProject,completeOldPath,false);
  FolderHelper folderHelper=getFolderHelper(getRepositoryContext().getProject().getEmfProject());
  FolderItem emfFolder=folderHelper.getFolder(completeOldPath);
  if (emfFolder == null && (type == ERepositoryObjectType.JOB_DOC || type == ERepositoryObjectType.JOBLET_DOC)) {
    IPath path=new Path(sourcePath.toString());
    ProxyRepositoryFactory.getInstance().createParentFoldersRecursively(project,type,path);
    emfFolder=folderHelper.getFolder(completeOldPath);
  }
  createFolder(getRepositoryContext().getProject(),type,targetPath,label);
  FolderItem newFolder=folderHelper.getFolder(completeNewPath);
  Item[] childrens=(Item[])emfFolder.getChildren().toArray();
  for (int i=0; i < childrens.length; i++) {
    if (childrens[i] instanceof FolderItem) {
      FolderItem children=(FolderItem)childrens[i];
      moveFolder(type,sourcePath.append(children.getProperty().getLabel()),targetPath.append(newFolder.getProperty().getLabel()));
    }
 else {
      moveOldContentToNewFolder(project,completeNewPath,emfFolder,newFolder,childrens[i]);
    }
  }
  List<IRepositoryViewObject> serializableFromFolder=getSerializableFromFolder(project,folder,null,type,true,true,true,false);
  for (  IRepositoryViewObject object : serializableFromFolder) {
    List<Resource> affectedResources=xmiResourceManager.getAffectedResources(object.getProperty());
    for (    Resource resource : affectedResources) {
      IPath path=getPhysicalProject(project).getFullPath().append(completeNewPath).append(resource.getURI().lastSegment());
      xmiResourceManager.moveResource(resource,path);
    }
  }
  deleteFolder(getRepositoryContext().getProject(),type,sourcePath);
  xmiResourceManager.saveResource(getRepositoryContext().getProject().getEmfProject().eResource());
}