3.x: Add fusion support to concatMap{Maybe|Single|Completable} #7165
+856
−491
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This PR adds front fusion support to
Flowable.concatMapCompletable
Flowable.concatMapMaybe
Flowable.concatMapSingle
Observable.concatMapCompletable
Observable.concatMapMaybe
Observable.concatMapSingle
The operators have been tidied up by factoring out common code paths.
In addition, the
DeferredScalarSubscription
's fusion-emission had to be fixed. In async fusion mode,onNext(null)
is generally expected from the upstream butDeferredScalarSubscription
sent the value itself. Now it correctly sendsnull
. (DeferredScalarDisposable
already did this correctly).Resolves #7061