toJson method
Converts this group node to a JSON map.
Implementation
@override
Map<String, dynamic> toJson(Object? Function(T value) toJsonT) => {
...super.toJson(toJsonT),
'title': currentTitle,
'color': currentColor.toARGB32(),
'behavior': behavior.name,
'nodeIds': _nodeIds.toList(),
'padding': [padding.left, padding.top, padding.right, padding.bottom],
};