fix: forward cancelled tasks to the inner task - #1236
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Fixes #1210
Imagine Page.waitForSelector, if a user cancels one of these api calls, the internal protocol calls are still pending and don't get canceled. When one of these errors out it setts the exception and it ends up in 'Future exception was never retrieved' (asyncio warning). I thought about two ways so far of fixing it:
a) if the outer task gets canceled "propagate" the canceled signal down to the protocol api call, see here for an impl: 2f8041c
b) store the "outer task" inside the ProtocolCallback class and check when receiving the error if it was canceled: https://github.com/microsoft/playwright-python/pull/1236/files
Not sure whats better! b) is definitely less code.
The failing lint is unrelated, it gets fixed in #1237.