Here, i have attached the PDF, that PDF document contains "Nudi" as an embedded font. When i searching the particular word (that in Nudi font), the search result selecting the word that context next to the exact word.

Link to PDF file (or attach file here):
[sample_pdf.zip](https://github.com/mozilla/pdf.js/files/229582/sample_pdf.zip)

Configuration:
- Web browser and its version: Mozilla 45.0.2
- Operating system and its version: Windows 7
- PDF.js version: 1.4.20-disc

What is the expected behavior? (add screenshot)
![find_01](https://cloud.githubusercontent.com/assets/17423938/14704922/c2e67f2c-07d4-11e6-9320-9aed2578d377.png)

const divIdx = begin.divIdx;
      textDivs[divIdx].textContent = "";
      appendTextToDiv(divIdx, 0, begin.offset, className);
    }
    function appendTextToDiv(divIdx, fromOffset, toOffset, className) {
      const div = textDivs[divIdx];
      const content = textContentItemsStr[divIdx].substring(
        fromOffset,
        toOffset
      );
      const node = document.createTextNode(content);
      if (className) {
        const span = document.createElement("span");
        span.className = className;
        span.appendChild(node);
        div.appendChild(span);
        return;
      }
      div.appendChild(node);
    }