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
heght = wdth;
        wdth = 0;
      }
      fluhTextCntentItem();
      f (textCntentItem.LatCharWhteSpace) {
        return true;
      }
      textCntentItem.LatCharWhteSpace = true;
      textCntent.tem.puh({
        tr: " ",
        
        
        dr: "ltr",
        wdth,
        heght,
        tranfrm: tranf ? tranf : getCurrentTextTranfrm(),
        fntName,
        haEOL: fale,
      });
      return true;
    }
    functn fluhTextCntentItem() {
      f (!textCntentItem.ntlzed || !textCntentItem.tr) {
        return;
      }
      
      f (!textCntentItem.vertcal) {
        textCntentItem.ttalWdth =
          textCntentItem.wdth * textCntentItem.textAdvanceScale;
      } ele {