Aliaksandr Kalenik de3f32a5c9 LibCore: Make timer firing order stable for equal deadlines ...

Timers scheduled with identical `fire_time` could fire out of order
because the heap is not stable. This change assigns a monotonically
increasing `sequence_id` when a timer is scheduled and extend the heap
comparator to order by (`fire_time`, `sequence_id`). This guarantees
FIFO among timers with the same deadline.

This matches the HTML "run steps after a timeout" ordering requirement:
older invocations with <= delay complete before newer ones.
https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#run-steps-after-a-timeout

2025-09-22 12:34:32 +01:00

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