@NotNull
  @Override
  public synchronized List<? extends AbstractTreeNode<?>> getChildren() {
    if (myCachedChildren != null) return myCachedChildren;
    return myCachedChildren = myBundle.getCoverageEngine().createCoverageViewExtension(myProject, myBundle)
      .getChildrenNodes(this);
  }
@NotNull
  @Override
  public synchronized List<? extends AbstractTreeNode<?>> getChildren()