getEstimatedExtentNid method
Estimated full extent for the live nid — measured value when
available, defaultExtent otherwise. Hot-path equivalent of
getEstimatedExtent that avoids the TKey→nid hash. Caller must
guarantee nid is live and within range.
Implementation
double getEstimatedExtentNid(int nid) {
// Read directly from the coordinator's full-extent cache — the key
// → nid hash is already done by the caller.
final key = _nids.keyOfUnchecked(nid);
return _anim.fullExtentOf(key) ?? defaultExtent;
}