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)

this.cancel();
    this.textContentStream = readableStream;
  }
  setTextContent(textContent) {
    this.cancel();
    this.textContent = textContent;
  }
  _convertMatches(matches, matchesLength) {
    
    if (!matches) {
      return [];
    }
    const { findController, textContentItemsStr } = this;
    let i = 0,
      iIndex = 0;
    const end = textContentItemsStr.length - 1;
    const queryLen = findController.state.query.length;
    const result = [];
    for (let m = 0, mm = matches.length; m < mm; m++) {
      
      let matchIdx = matches[m];
      
      while (i !== end && matchIdx >= iIndex + textContentItemsStr[i].length) {
        iIndex += textContentItemsStr[i].length;
        i++;
      }
      if (i === textContentItemsStr.length) {
        console.error("Could not find a matching mapping");