Alex Hoppen 2fcb24e716 [CodeCompletion] Refactor how code completion results are returned to support cancellation ...

This refactors a bunch of code-completion methods around `performOperation` to return their results via a callback only instead of the current mixed approach  of indicating failure via a return value, returning an error string as an inout parameter and success results via a callback. The new guarantee should be that the callback is always called exactly once on control flow graph.

Other than a support for passing the (currently unused) cancelled state through the different instance, there should be no functionality change.

2021-10-28 11:10:30 +02:00

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