1.x: create+subscribeOn avoid same-pool deadlock #5091
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This PR allows to fix the same-pool deadlock that may happen with
create()(formerlyfromEmitter) andsubscribeOnassubscribeOnby default schedules the requests behind a running emitter and thus the internal request amount may not get updated, leading to unnecessary dataloss.See #4735.
In the update, if
subscribeOndetects its upstream isOnSubscribeCreate, it no longer reschedules requests for it. For other, non-immediate cases, a new overload allows specifying therequestOnparameter that should befalseif there is acreate(Action1, BackpressureStrategy)in the sequence upstream.