toPathD method
The current shape as an SVG d attribute.
At rest this is the target's canonical d; in flight it is the polyline
the plan is producing, quantized to 2 decimals — byte for byte what the
web bindings would have written to the element. Nothing in the Flutter
render path uses it; it is here for interop and for asserting that this
implementation agrees with the TypeScript one.
Implementation
String toPathD() {
final o = _out;
final cl = _closed;
if (_rest || o == null || cl == null) return canonicalD(_target);
return serialize(o, cl);
}