A dart extension on a list of flutter widgets so that it can add padding between each one.

with_sized_box_between.dart

import 'package:collection/collection.dart';
import 'package:flutter/material.dart';

extension WidgetListSpacing on List<Widget> {
  List<Widget> withSizedBoxBetween({double? width, double? height}) {
    final box = SizedBox(width: width, height: height);
    return mapIndexed((index, widget) => index == 0 || index == length ? [widget] : [box, widget]).flattened.toList();
  }
}