abortDrawing_() {
    this.finishCoordinate_ = null;
    const sketchFeature = this.sketchFeature_;
    this.sketchFeature_ = null;
    this.sketchPoint_ = null;
    this.sketchLine_ = null;
    this.overlay_.getSource().clear(true);
    this.deactivateTrace_();
    return sketchFeature;
  }
Stop drawing without adding the sketch feature to the target layer.
@return {Feature<import("../geom/SimpleGeometry.js").default>|null} The sketch feature (or null if none).
@private