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Matthew Hodgson
d8a2ac75a8
* Fix CurrentValuePublisher.map dropping updates when the mapped publisher is chained inline
The eager implementation bridged through a second CurrentValueSubject fed by
a sink whose AnyCancellable was stored on the returned struct. Combine
consumes publisher structs when building a subscription, so chaining the
mapped publisher inline (e.g. `publisher.map { … }.removeDuplicates(…)
.sink { … }`, as RoomScreenViewModel and RoomDetailsScreenViewModel do for
knock requests) dropped the only copy holding that cancellable: the feeding
sink was cancelled and subscribers only ever received the initial value.
In practice this meant a room admin viewing a knockable room never saw the
"wants to join" banner (or a live "Requests to join" badge) for a knock
arriving while the room was open — it only appeared when the knock predated
opening the room. Caught by a live cross-client knocking test; the
double-execution of the transform at subscription time (eager transform +
current-value replay) was the giveaway.
Make map lazy instead: keep the transformed AnyPublisher and a value
provider, so subscribers attach straight through to the source subject (which
replays its current value itself) and no keep-alive is needed. Adds a
regression test chaining a mapped publisher inline.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* swiftformat
* better docs
---------
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Mauro Romito <mauro.romito@element.io>