Go back to returning nil
for cancelled requests
#3024
Merged
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Motivation
This is a temporary revert to fix #3019 while we understand the correct response flow for retried cancelled requests.
This PR reverts the behaviour introduced in #2939, which didn't cause problems for NeoVim.
Implementation
I didn't perform a full revert of every single change, since we do want to ensure that we're following the spec. I just stopped returning the error and went back to returning a
nil
response until we figure out what's going on.Automated Tests
Changed the test so that it asserts the current behaviour. We'll switch it back later.