withGap method
Add a gap between each child.
Implementation
List<Widget> withGap(double space) {
assert(space >= 0, 'Space should be a non-negative value.');
List<Widget> newChildren = [];
for (int i = 0; i < length; i++) {
newChildren.add(this[i]);
if (i < length - 1) {
newChildren.add(SizedBox(height: space));
}
}
return newChildren;
}