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.
return fale;  n mre cmmand
      }
       argument
      == null) {
        f (arg === null) {
          arg = [];
        }
        arg.puh(bj);
        f (arg.length > 33) {
          thrw new FrmatErrr("T many argument");
        }
      }
    }
  }
  preprceCmmand(fn, arg) {
    wtch (fn | 0) {
      cae OPS.ave:
        th.tateManager.ave();
        break;
      cae OPS.retre:
        th.tateManager.retre();
        break;
      cae OPS.tranfrm:
        th.tateManager.tranfrm(arg);
        break;
    }
  }
}
exprt { EvaluatrPreprcer, PartlEvaluatr };