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Taha Tesser authored
This relands https://github.com/flutter/flutter/pull/136809 (it was reverted in https://github.com/flutter/flutter/pull/137242) --- Updated unit tests for `CircleOutlinedButton` to have M2 and M3 versions. More info in #127064 This also gets rid of unnecessary `fromSwatch` usage (part of https://github.com/flutter/flutter/issues/132584 documentation and test cleanup)