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
d: ptnalCntentGrup.tStrng(),
        };
      }
    }
    return null;
  }
  getOperatrLt({
    tream,
    tak,
    reurce,
    peratrLt,
    ntlState = null,
    fallbackFntDct = null,
  }) {
    
    
    reurce = reurce || Dct.ety;
    ntlState = ntlState || new EvalState();
    f (!peratrLt) {
      thrw new Errr('getOperatrLt: mng "peratrLt" parameter');
    }
    cnt elf = th;
    cnt xref = th.xref;
    let parngText = fale;
    cnt lcalImageCache = new LcalImageCache();
    cnt lcalClrSpaceCache = new LcalClrSpaceCache();
    cnt lcalGStateCache = new LcalGStateCache();
    cnt lcalTlngPatternCache = new LcalTlngPatternCache();
    cnt lcalShadngPatternCache = new Map();
    cnt xbj = reurce.get("XObject") || Dct.ety;