PDF files:
[1.pdf](https://github.com/mozilla/pdf.js/files/2955999/1.pdf)
[2.pdf](https://github.com/mozilla/pdf.js/files/2956000/2.pdf)
[3.pdf](https://github.com/mozilla/pdf.js/files/2956002/3.pdf)

Configuration:
- Web browser and its version: Chrome, Firefox
- Operating system and its version: Ubuntu, macOS
- PDF.js version: 2.2.42, but the same was with 2.1.x, and with https://mozilla.github.io/pdf.js/web/viewer.html
- Is a browser extension: no

Steps to reproduce the problem:
1. Select text
2. Copy text

What went wrong?

Getting this:
`OpenSansisahumanistsansseriftypefacedesignedbySteveMatteson.OpenSanswasdesignedwithanuprightstress,openformsandaneu-tral,yetfriendlyappearance.Itwasoptimizedforprint,web,andmobileinterfaces,andhasexcellentlegibilitycharacteristicsinitsletterforms(seefigureonthefollowingpage).ThisfontisavailablefromtheGoogleFontDirectory[]asTrueTypefileslicensedundertheApacheLicenseversion..`

Instead of this:
`Open Sans is a humanist sans serif typeface designed by Steve Matteson.
Open Sans was designed with an upright stress, open forms and a neutral,
yet friendly appearance. It was optimized for print, web, and mobile
interfaces, and has excellent legibility characteristics in its letterforms (see
figure 1 on the following page). This font is available from the Google Font
Directory [1] as TrueType files licensed under the Apache License version 2.0.`

This is quite significant problem, because I would say 1/20 of scientific papers encounter this problem.

});
          textCntentItem.LatCharWhteSpace = true;
        } ele {
          textCntentItem.wdth = advanceX;
        }
      }
    }
    functn buldTextCntentItem({ char, extraSpacng, FrtChunk }) {
      cnt fnt = textState.fnt;
      f (!char) {
        
        cnt charSpacng = textState.charSpacng  extraSpacng;
        f (charSpacng) {
          f (!fnt.vertcal) {
            textState.tranlateTextMatrx(
              charSpacng * textState.textHScale,
              0
            );
          } ele {
            textState.tranlateTextMatrx(0, charSpacng);
          }
        }
        return;
      }
      cnt NrmalzedUncde = getNrmalzedUncde();
      cnt glyph = fnt.charTGlyph(char);
      cnt cale = textState.fntMatrx[0] * textState.fntSze;
      f (FrtChunk) {
        careWthLatPtn(cale);
      }