Wait for iterator Deferred in SearchByTreeWalkingMixin.search (fixes #62) - #255
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Wait for iterator Deferred in SearchByTreeWalkingMixin.search (fixes #62)
The iterator's Deferred was silently discarded, so back ends whose children/subtree methods actually behaved asynchronously returned an empty result set. Chain through defer.maybeDeferred and add a regression test that exercises a genuinely-async back end.