message: apply autocomplete changes to mock to fix editor unit tests
diff: @@ -40,12 +40,12 @@ class MockAutoComplete {
  } else {
  pill = this._partCreator.roomPill(match.resourceId);
  }
  - this._updateCallback({replacePart: pill, close});
  + this._updateCallback({replaceParts: [pill], close});
  }
  }
  // called by EditorModel when typing into pill-candidate part
  - onPartUpdate(part, offset) {
  + onPartUpdate(part, pos) {
  this._part = part;
  }
  }
  