toStringWithIndentation method
Implementation
void toStringWithIndentation(StringBuffer result, int level) {
var indentation = StringBuffer();
for (var i = 0; i < level; ++i) {
indentation.write("__");
}
result.write(indentation.toString());
result.write(_flexNodeStyle.toString());
result.write(resultToString());
result.write("$indentation]");
}