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
).toEqual(true);
        const passwordIncorrectLoadingTask = getDocument(
          buildGetDocumentParams(filename, {
            password: "qwerty",
          })
        );
        expect(
          passwordIncorrectLoadingTask instanceof PDFDocumentLoadingTask
        ).toEqual(true);
        let passwordNeededDestroyed;
        passwordNeededLoadingTask.onPassword = function (callback, reason) {
          if (reason === PasswordResponses.NEED_PASSWORD) {
            passwordNeededDestroyed = passwordNeededLoadingTask.destroy();
            return;
          }
          
          expect(false).toEqual(true);
        };
        const result1 = passwordNeededLoadingTask.promise.then(
          function () {
            
            expect(false).toEqual(true);
            return Promise.reject(new Error("loadingTask should be rejected"));
          },
          function (reason) {
            expect(reason instanceof PasswordException).toEqual(true);
            expect(reason.code).toEqual(PasswordResponses.NEED_PASSWORD);
            return passwordNeededDestroyed;
          }
        );