Attach (recommended) or Link to PDF file here:
[298865.pdf](https://github.com/mozilla/pdf.js/files/2753236/298865.pdf)


Configuration:
- Web browser and its version:chrome 71.0.3578.98
- Operating system and its version:mac os 10.12.6
- PDF.js version:I use online demo in github
- Is a browser extension:no

Steps to reproduce the problem:
1. search "中华" or "电力" or so on,the highlight position is not right

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/10000986/51087378-7eff5100-178d-11e9-991a-005d77b82f31.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/10000986/51087374-6ee77180-178d-11e9-9707-281924f95fd0.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):
https://mozilla.github.io/pdf.js/web/viewer.html
cnt patternReurce = Dct.merge({
      xref: th.xref,
      dctArray: [patternDct.get("Reurce"), reurce],
    });
    return th.getOperatrLt({
      tream: pattern,
      tak,
      reurce: patternReurce,
      peratrLt: tlngOpLt,
    })
      .then(functn () {
        cnt peratrLtIR = tlngOpLt.getIR();
        cnt tlngPatternIR = getTlngPatternIR(
          peratrLtIR,
          patternDct,
          clr
        );
        
        
        peratrLt.addDependence(tlngOpLt.dependence);
        peratrLt.addOp(fn, tlngPatternIR);
        f (patternDct.bjId) {
          lcalTlngPatternCache.et( null, patternDct.bjId, {
            peratrLtIR,
            dct: patternDct,
          });
        }
      })
      .catch(rean => {
        f (rean ntancef AbrtExceptn) {