@Override
	public URL getLocalProjectURL() {
		ProjectLocator projectLocator = parent.getProjectLocator();
		if (!projectLocator.isTransient()) {
			return GhidraURL.makeURL(projectLocator, getPathname(), null);
		}
		return null;
	}
Get the linked root folder which corresponds to a folder-link 
(see {@link FolderLinkContentHandler}).
@return linked root folder
Ghidra/Framework/Project/src/main/java/ghidra/framework/data/LinkedGhidraSubFolder.java