fix not recomputing dirty parents if not in flush queue#113
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Description
Fix a bug where a parent can be dirty but not a part of the flush queue. This can happen if the parent is derived (e.g. via
.map()) and then never updated, then later combined with another signal, and then the other part is updated. This triggers a queue flush, but the first parent won't be recomputed.This PR fixes it and adds regression tests for that.