[3.7] bpo-35125: remove inner callback on outer cancellation in asyncio shield (GH-10340) #13167
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When the future returned by shield is cancelled, its completion callback of the
inner future is not removed. This makes the callback list of inner inner future
grow each time a shield is created and cancelled.
This change unregisters the callback from the inner future when the outer
future is cancelled.
https://bugs.python.org/issue35125
(cherry picked from commit b35acc5)
Co-authored-by: Romain Picard [email protected]
https://bugs.python.org/issue35125