Program: 130152
Project: 130152
Buggy source:
private void openFolderSelectionDialog(boolean needCancelButton){
  RepositoryFolderSelectionDialog dialog=new RepositoryFolderSelectionDialog(getShell());
  dialog.setInput(getRepositoryObjectType());
  dialog.setContentProvider(new FoldersContentProvider());
  dialog.setLabelProvider(new FoldersLabelProvider(dialog));
  dialog.setTreeListener(new ITreeViewerListener(){
    public void treeCollapsed(    TreeExpansionEvent event){
      setItemImage(event,true);
    }
    public void treeExpanded(    TreeExpansionEvent event){
      setItemImage(event,false);
    }
    /** 
 * yzhang Comment method "setItemImage".
 * @param event
 */
    private void setItemImage(    TreeExpansionEvent event,    boolean isCollpased){
      Tree tree=((TreeViewer)event.getSource()).getTree();
      Object element=event.getElement();
      TreeItem item=getTreeObject(tree,element);
      if (isCollpased) {
        item.setImage(ImageProvider.getImage(ECoreImage.FOLDER_CLOSE_ICON));
      }
 else {
        item.setImage(ImageProvider.getImage(ECoreImage.FOLDER_OPEN_ICON));
      }
    }
  }
);
  dialog.setTitle(Messages.getString("String_Node_Str"));
  dialog.setMessage(Messages.getString("String_Node_Str"));
  if (dialog.open() == Window.OK) {
    if (dialog.getResult().length > 0) {
      Folder folder=(Folder)dialog.getResult()[0];
      if (folder.getPath() == null) {
        pathText.setText("String_Node_Str");
      }
 else {
        String pathString="String_Node_Str";
        if (folder != null) {
          pathString=getFolderPath(getParentsFolder(folder));
        }
        pathText.setText(pathString);
        this.path=pathString;
      }
    }
  }
}

Fixed version (ground truth):
private void openFolderSelectionDialog(boolean needCancelButton){
  RepositoryFolderSelectionDialog dialog=new RepositoryFolderSelectionDialog(getShell());
  dialog.setInput(getRepositoryObjectType());
  dialog.setContentProvider(new FoldersContentProvider());
  dialog.setLabelProvider(new FoldersLabelProvider(dialog));
  dialog.setTreeListener(new ITreeViewerListener(){
    @Override public void treeCollapsed(    TreeExpansionEvent event){
      setItemImage(event,true);
    }
    @Override public void treeExpanded(    TreeExpansionEvent event){
      setItemImage(event,false);
    }
    /** 
 * yzhang Comment method "setItemImage".
 * @param event
 */
    private void setItemImage(    TreeExpansionEvent event,    boolean isCollpased){
      Tree tree=((TreeViewer)event.getSource()).getTree();
      Object element=event.getElement();
      TreeItem item=getTreeObject(tree,element);
      if (isCollpased) {
        item.setImage(ImageProvider.getImage(ECoreImage.FOLDER_CLOSE_ICON));
      }
 else {
        item.setImage(ImageProvider.getImage(ECoreImage.FOLDER_OPEN_ICON));
      }
    }
  }
);
  dialog.setTitle(Messages.getString("String_Node_Str"));
  dialog.setMessage(Messages.getString("String_Node_Str"));
  if (dialog.open() == Window.OK) {
    if (dialog.getResult().length > 0) {
      Folder folder=(Folder)dialog.getResult()[0];
      if (folder.getPath() == null) {
        pathText.setText("String_Node_Str");
      }
 else {
        String pathString="String_Node_Str";
        if (folder != null) {
          pathString=getFolderPath(getParentsFolder(folder));
        }
        pathText.setText(pathString);
        this.path=pathString;
      }
    }
  }
}