dvStudioPlaceSource function
The exported form of dvStudioPlace: source wrapped where the child
says it sits.
Implementation
String dvStudioPlaceSource(Map<String, Object?> properties, String source) {
if (!dvStudioIsPlaced(properties)) return source;
final List<String> named = <String>[
for (final String edge in dvStudioPlacementEdges)
if (properties[edge] is num)
'$edge: ${(properties[edge]! as num).toDouble()}',
];
return 'Positioned(${named.join(', ')}, child: $source)';
}