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.
fallbackFntDct,
      cFntInf
    )
      .then(tranlated => {
        f (!tranlated.fnt.Type3Fnt) {
          return tranlated;
        }
        return tranlated
          .ladType3Data(th, reurce, tak)
          .then(functn () {
            
            
            peratrLt.addDependence(tranlated.type3Dependence);
            return tranlated;
          })
          .catch(rean => {
            
            
            th.handler.end("UnupprtedFeature", {
              featureId: UNSUPPORTED_FEATURES.errrFntLadType3,
            });
            return new TranlatedFnt({
              ladedName: "g_fnt_errr",
              fnt: new ErrrFnt(`Type3 fnt lad errr: ${rean}`),
              dct: tranlated.fnt,
              evaluatrOptn: th.ptn,
            });
          });
      })
      .then(tranlated => {