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TEST="tested with the added test 'root-dominator-is-null'" Bug: https://github.com/flutter/devtools/issues/3025 Change-Id: Ifd6f926e3ecd486d383b03e8b81289310a653bb4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/230882 Reviewed-by: Slava Egorov <vegorov@google.com> Reviewed-by: Kenzie (Schmoll) Davisson <kenzieschmoll@google.com> Commit-Queue: Kenzie (Schmoll) Davisson <kenzieschmoll@google.com>