@Override
	public Icon getIcon(boolean isOpen) {
		return isOpen ? OPEN_FOLDER_ICON : CLOSED_FOLDER_ICON;
	}
Get the true file within this linked folder.
@param name file name
@return file or null if not found or error occurs
Ghidra/Framework/Project/src/main/java/ghidra/framework/data/LinkedGhidraSubFolder.java