dropUntil doesn't complete output when other completes

Docs of dropUntil actually stand that:

Starts emitting the input stream when another stream emits a next event. The output stream will complete if/when the other stream completes.

But actually, it is not the case, due to this output stream just start to emit when other stream completes.

Test for this case actually tests that output starts when other complets, though it is called should complete the stream when another stream emits complete.

So there’s is something wrong with either the operator’s code or its docs/tests.

[wclr]

So this actually should nor start emitting source (which is a current actual behavior) nor should complete it (which is a behaviour described in docs and test). 😃

[xtianjohns]

Hey @whitecolor, let me know if behavior in my PR makes sense to you - I’m happy to clarify here how it is changed.