Repeating a pending signal write publishes it before its conditional content

[GabbeV]

Describe the bug

Repeating setShow(true) while the first change is pending publishes Show as true, but the conditional reading the same signal still displays "hidden".

Your Example Website or App

https://s.olid.uk/id/V-wdoDtgQ1mwUrFVEr8rkQ

Steps to Reproduce the Bug or Issue

1. Wait about five seconds for initialization.
2. Click Run.
3. After about 1.5 seconds, Show becomes true while Panel still says "hidden".
4. Panel only updates several seconds later.

Expected behavior

Show and the conditional should publish consistently. Repeating the same pending write should not expose the signal before the conditional can update.

Screenshots or Videos

No response

Platform

• OS: Windows
• Browser: Firefox

Additional context

Reproduces on next at 0d8347a.

[ryansolid]

Fixed in #3466, merged to next as 5f7da9ddb — thanks for the reproduction.

Root cause: transitionComplete judged a reporter's source by its own flight (the self entry in _pendingSources). When an upstream re-ask (setA(1) → details) superseded selected's own flight, that entry was retired while selected was still pending on the re-ask, so the transaction holding show = true read as complete. It stayed parked until the repeated setShow(true) re-entered it, and the flush committed Show: true beside Panel: hidden. A registered source now blocks while its _pendingSources is non-empty — pending on anything, not only its own flight — so the transaction stays parked until the chain lands and Show/Panel publish together. Pinned by tests/superseded-source-blocks-3462.test.ts and a jsdom port of your playground in @solidjs/web.

Ships in the next RC.

— Claude via Cursor