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)

if (!this.renderingDone) {
      return;
    }
    const {
      findController,
      matches,
      pageIdx,
      textContentItemsStr,
      textDivs,
    } = this;
    let clearedUntilDivIdx = -1;
    
    for (let i = 0, ii = matches.length; i < ii; i++) {
      const match = matches[i];
      const begin = Math.max(clearedUntilDivIdx, match.begin.divIdx);
      for (let n = begin, end = match.end.divIdx; n <= end; n++) {
        const div = textDivs[n];
        div.textContent = textContentItemsStr[n];