debugDescribeChildren method Null safety
Returns a list of DiagnosticsNode objects describing this node's children.
Children that are offstage should be added with
style set to
DiagnosticsTreeStyle.offstage to indicate that they are offstage.
The list must not contain any null entries. If there are explicit null children to report, consider new DiagnosticsNode.message or DiagnosticsProperty<Object> as possible DiagnosticsNode objects to provide.
- RenderTable.debugDescribeChildren, which provides high quality custom descriptions for its child nodes.
@override List<DiagnosticsNode> debugDescribeChildren() => <DiagnosticsNode>;