renderHash method
Returns a cached hash of the line's rendered content.
Implementation
int renderHash() {
final cached = _renderHash;
if (cached != null) return cached;
var hash = 0;
for (var i = 0; i < _cells.length; i++) {
hash ^= _slotHash(i, _cells[i].renderFingerprint);
}
_renderHash = hash;
return hash;
}