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ef5d81498a
Narrows the merged frame stream to one capture source BEFORE counting, slicing and bucketing (frame_count / frames | buckets all recomputed on the narrowed set), AND-composing with the display filter. A pure identity filter applied before any engine work — only the selected link's pcap gets a sharkd pass, so link+filter is cheaper than filter alone. Two boundaries by contract with the Web UI: - sources[] stays the tag's stable inventory: every capture source listed with engine-free TOTAL counts, unaffected by link/filter — a source dropdown must not shrink when the view narrows (this also settles sources[].count on total counts rather than post-filter matches, which no spec ever required) - an unknown link_id matches nothing: frame_count 0, start null, empty frames/buckets — the same shape as a zero-match display filter, deliberately not a 404; an empty link param is treated as absent