Fix publishing of PayloadApplicationEvents in parent context #30420
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This commit introduces a more defensive propagation of an event
and the optionally associated eventType when calling
publishEvent
,especially when a parent context is present.
Notably, it avoids a situation where the parent
publishEvent
callwould generate a new
PayloadApplicationEvent
with the wrong eventType(
PayloadApplicationEvent<PayloadApplicationEvent<T>>
).This commit also adds test coverage (which includes cases where an event
is fired before the multicaster is set) and a defensive check against
inconsistent publishing of a PayloadApplicationEvent (even though that
is something that is expected to be done mostly internally by the
framework).
See gh-30360
Closes gh-30420