private boolean isInProgress(List<GTreeNode> childList) {
		if (childList != null && childList.size() == 1 &&
			childList.get(0) instanceof InProgressGTreeNode) {
			return true;
		}
		return false;
	}
Returns true if the node is in the process of loading its children.  For nodes
that directly extend GTreeNode, this is always false.  See {@link GTreeSlowLoadingNode}
for information on nodes that can be in the progress of loading.
@param childList the list to test.
@return true if the node is in the progress of loading its children.
Ghidra/Framework/Docking/src/main/java/docking/widgets/tree/CoreGTreeNode.java