gh-97907: use cancellation error from child if possible #133243
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At present when cancelling the result of an :func:`asncio.gather` call, the last child is used to create the cancellation error. If that was not cancelled but another child was, its cancellation message and traceback will be lost. Fix this by using the cancellation error from the first of the children to be cancelled, if any, falling back to the last child only if none have been.
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At present when cancelling the result of an :func:
asncio.gathercall, the last child is used to create the cancellation error. If that was not cancelled but another child was, its cancellation message and traceback will be lost.Fix this by using the cancellation error from the first of the children to be cancelled, if any, falling back to the last child only if none have been.