TLDR;
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The intention of the PR is to make a future from gather return that cancelled() is True if, and only if, cancel() has successfully been called on it (explicit user intent) and it was awaited/has finished. All other finishing is not considered explicit user intent and has the state FINISHED (with exception or result), even if the exception is a CancelledError.

As mentioned, just my interpretation based on the logic i've seen.