debugRenderBoxes method
Implementation
String debugRenderBoxes(_PopUpList? popUpList) {
final sl = <String>[];
var child = listOf(popUpList)?.firstChild;
while (child != null) {
sl.add('(${parentDataOf(child)?.index}: ${debugRenderBox(child)})');
child = _childAfter(child);
}
return '{${sl.join(', ')}}';
}