Fix SwitchOnFirst
hanging subscription
#3939
Merged
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In a situation where
SwitchOnFirstMain
is subscribed to after the operator itself has terminated, the expectation is that either an error is propagated due to cancellation of the source or the first actual subscription succeeds. Due to a regression introduced in #2794 the subscription would hang with no termination. This change addresses the issue and the subscrption properly terminates.Related to #3936.