Attach (recommended) or Link to PDF file here:
https://bitcoin.org/bitcoin.pdf

Configuration:
- Web browser and its version: all
- Operating system and its version: all
- PDF.js version: tested with 2.9.11, but most likely all versions
- Is a browser extension: no

Steps to reproduce the problem:
1. Type "a purely" (single space between "a" and "purely") - doesn't find anything
2. Type "a  purely" (two spaces between "a" and "purely") - finds the phrase

Sometimes even 3 spaces are necessary.

What is the expected behavior? (add screenshot)
![Screenshot from 2021-04-08 13-00-03](https://user-images.githubusercontent.com/6362989/114008903-57639a00-986b-11eb-903a-92bbebbd922b.png)

What went wrong? (add screenshot)
![Screenshot from 2021-04-08 13-01-53](https://user-images.githubusercontent.com/6362989/114008810-44e96080-986b-11eb-8232-f58a62ed7899.png)

This affects many PDFs because justify alignment is common enough.
});
          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);
      }