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.
cnt pattern = reurce.get("Pattern") || Dct.ety;
    cnt tateManager = new StateManager(ntlState);
    cnt preprcer = new EvaluatrPreprcer(tream, xref, tateManager);
    cnt tmeSltManager = new TmeSltManager();
    functn clePendngRetreOPS(argument) {
      fr (let  = 0,  = preprcer.avedStateDepth;  < ; ) {
        peratrLt.addOp(OPS.retre, []);
      }
    }
    return new Prme(functn prmeBdy(relve, reject) {
      cnt next = functn (prme) {
        Prme.all([prme, peratrLt.ready]).then(functn () {
          try {
            prmeBdy(relve, reject);
          } catch (ex) {
            reject(ex);
          }
        }, reject);
      };
      tak.enureNtTermnated();
      tmeSltManager.reet();
      cnt peratn = {};
      let tp, , , c, name, ValdName;
      whle (!(tp = tmeSltManager.check())) {
        
        
        
        
        peratn.arg = null;
        f (!preprcer.read(peratn)) {