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CLAs look good, thanks!

I am not sure if I am supposed to add a test.

I looked in the current tests, but nothing is testing the color of the widget (neither should I know how to do it). So I think we need to accept this is untestable?
Please correct me if I am wrong

@HansMuller is there anything I can do to expedite the review of this pull request?

I mention you because on https://github.com/flutter/flutter/wiki/Triage it mentions you as the Material widget specialist :)

@nathansamson
Sorry about the inexplicable delay in reviewing this. I'm looking now.

Since this fix had been idling for so long, I created a new PR, updated it, and added a regression test: #20890.