Fix issue 56806, incorrect ignore on futures.
Makes `whenComplete` create a new future with either the result of the
original, or the error of a future returned by the callback.
Until now it was returning the original future, causing it to be chained after
it was completed. That caused issue with `ignore()`.
(Which suggests that there is still something iffy about ignore and chaining.)
Combines `chainCoreFuture{Sync,Async}` into one function with boolean flag.
Most of the code is the same, and they had accidentally drifted apart.
Fixes #56806.
CoreLibraryReviewExempt: Should be simple refactoring.
Tested: Regression test added
Bug: http://dartbug.com/56806
Change-Id: I52751c078a4e26a10e9da0a64460e2c5c7f34ae5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/387360
Commit-Queue: Lasse Nielsen <lrn@google.com>
Reviewed-by: Nate Bosch <nbosch@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
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