@Nullable
  private static StackFrameDescriptorImpl getSelectedStackFrameDescriptor(AnActionEvent e) {
    DebuggerTreeNodeImpl selectedNode = getSelectedNode(e.getDataContext());
    if (selectedNode != null) {
      NodeDescriptorImpl descriptor = selectedNode.getDescriptor();
      if (descriptor instanceof StackFrameDescriptorImpl) {
        return (StackFrameDescriptorImpl)descriptor;
      }
    }
    return null;
  }
@Nullable
  private static StackFrameDescriptorImpl getSelectedStackFrameDescriptor(AnActionEvent e)