toString method

@override String toString()

Renders this encoding the way canon composes one, so display and wire agree.

With no raw schema, mimeType verbatim. Otherwise mimeType up to but excluding its first ;, then ;, then the raw schema -- canon's z_encoding_set_schema_from_substr REPLACES rather than appends, so Encoding('text/plain;old').withSchema('new') renders text/plain;new and agrees with what the wire carries. A naive concatenation would render text/plain;old;new and contradict it.

Implementation

@override
String toString() {
  final raw = _schema;
  if (raw == null) return mimeType;
  final separator = mimeType.indexOf(_schemaSeparator);
  final base = separator < 0 ? mimeType : mimeType.substring(0, separator);
  return '$base$_schemaSeparator$raw';
}