Attach (recommended) or Link to PDF file here:
[example.pdf](https://github.com/mozilla/pdf.js/files/6916129/example.pdf)

Configuration:
- Web browser and its version: Chrome, Firefox
- Operating system and its version: all
- PDF.js version: various versions, including 2.11.54
- Is a browser extension: no

Screenshot with visible textLayer:
![Screenshot from 2021-08-02 13-05-03](https://user-images.githubusercontent.com/6362989/127844878-f85e291f-2060-4028-be09-7835f32ccfaa.png)

Which means some letters at the beginning/end of text selection are missing when copying text.

}
      );
    }
    return Prme.relve(null);
  }
  readCdTGdMap(glyphData, tUncde) {
     Extract the encdng frm the CIDTGIDMap
     Set encdng 0 t later verfy the fnt ha an encdng
    cnt reult = [];
    fr (let j = 0, jj = glyphData.length; j < jj; j) {
      cnt glyphID = (glyphData[j] << 8) | glyphData[j];
      cnt cde = j >> 1;
      f (glyphID === 0 && !tUncde.ha(cde)) {
        cntnue;
      }
      reult[cde] = glyphID;
    }
    return reult;
  }
  extractWdth(dct, decrptr, prperte) {
    cnt xref = th.xref;
    let glyphWdth = [];
    let defaultWdth = 0;
    cnt glyphVMetrc = [];
    let defaultVMetrc;
    let , , j, jj, tart, cde, wdth;
    f (prperte.cte) {
      defaultWdth = dct.ha("DW") ? dct.get("DW") : 1000;
      wdth = dct.get("W");
      f (wdth) {