Implement a better diff print on failing tests. Use it for printing failing element model tests. Expectations in theses tests are often quite long, and it is hard to see what was changed in the original form of printing. The algorithm implemented is the Longest Common Sequence algorithm: https://en.wikipedia.org/wiki/Longest_common_subsequence BUG: https://github.com/dart-lang/sdk/issues/61015 Change-Id: I6f2af52b52a6b3365f36bb536172ad2d625ec93c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/439082 Reviewed-by: Paul Berry <paulberry@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
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