https://pdf.yt/d/BeioWriXAn-DkFcO

When searching the above pdf for the phrase 'acute' the second hit hightlights the nearby word ' especi'.  Almost certainly this is the same issue that I raised in #5667 

However, when examining the generated html you can see that the highlighted text is incorrect - it contains the text ' especi' and not the search term 'acute' - it is not a positioning issue.  (see screenshot).

I am using Chrome 39, windows 8.1 x64 and pdf.js 1.0.1093

![image](https://cloud.githubusercontent.com/assets/10129039/5864096/f2d665a4-a276-11e4-91fa-af6eb36f0cde.png)

const matches = [];
    const queryLen = query.length;
    let matchIdx = -queryLen;
    while (true) {
      matchIdx = pageContent.indexOf(query, matchIdx + queryLen);
      if (matchIdx === -1) {
        break;
      }
      if (entireWord && !this._isEntireWord(pageContent, matchIdx, queryLen)) {
        continue;
      }
      matches.push(matchIdx);
    }
    this._pageMatches[pageIndex] = matches;
  }
  _calculateWordMatch(query, pageIndex, pageContent, entireWord) {
    const matchesWithLength = [];
    
    const queryArray = query.match(/\S+/g);
    for (let i = 0, len = queryArray.length; i < len; i++) {
      const subquery = queryArray[i];
      const subqueryLen = subquery.length;
      let matchIdx = -subqueryLen;
      while (true) {
        matchIdx = pageContent.indexOf(subquery, matchIdx + subqueryLen);
        if (matchIdx === -1) {
          break;