The test file at https://github.com/mozilla/pdf.js/blob/master/test/pdfs/annotation-choice-widget.pdf contains listboxes, which are not rendered correctly when printed right now. These kinds of fields are made by https://github.com/mozilla/pdf.js/blob/master/src/display/annotation_layer.js#L672-L678.

/cc @calixteman 
if (typeof cTrigger !== "string" || typeof cScript !== "string") {
      return;
    }
    if (!(cTrigger in this._actions)) {
      this._actions[cTrigger] = [];
    }
    this._actions[cTrigger].push(cScript);
  }
  setFocus() {