Proposal to improve `List` readability in this repository

[nate-thegrate]

Now that the switch expressions issue is close to being wrapped up (yay!), I think it'd be nice to embark on a similar cleanup for collection types.

Control Flow Collections

// before
final result = <Object>[];
result.add(value1);
if (condition) {
  result.add(value2);
}
if (list != null) {
  result.addAll(list!);
}
return result;

// after
return <Object>[
  value1,
  if (condition) value2,
  ...?list,
];

[nate-thegrate]

Originally I was thinking about refactoring a bunch of itemBuilder callbacks after the control flow collections were done, but it's a lot of hassle (both the refactoring and the review process) for barely any benefit.

I'm going to mark this as "completed" and move on to more exciting stuff! :)

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