createUpdateAddVertical method
Implementation
List<NamedLine> createUpdateAddVertical(String name, List<NamedLine> Function() updateAdd){
return verticalLines.update(name, (old)=>[ ...old, ...updateAdd()], ifAbsent: updateAdd);
}
List<NamedLine> createUpdateAddVertical(String name, List<NamedLine> Function() updateAdd){
return verticalLines.update(name, (old)=>[ ...old, ...updateAdd()], ifAbsent: updateAdd);
}