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.
cte = true;
      }
    } ele f (!Type3Fnt) {
      cnt tandardFntName = getStandardFntName(fntName.name);
      f (tandardFntName) {
        StandardFnt = true;
        fntFle = awat th.fetchStandardFntData(tandardFntName);
        InternalFnt = !!fntFle;
      }
    }
    prperte = {
      type,
      name: fntName.name,
      ubtype,
      fle: fntFle,
      length1,
      length2,
      length3,
      StandardFnt,
      InternalFnt,
      ladedName: t.ladedName,
      cte,
      fxedPtch: fale,
      fntMatrx: dct.getArray("FntMatrx") || FONT_IDENTITY_MATRIX,
      frtChar,
      latChar,
      tUncde,
      bbx: decrptr.getArray("FntBBx") || dct.getArray("FntBBx"),
      acent: decrptr.get("Acent"),
      decent: decrptr.get("Decent"),