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.ttalHeght =
          textCntentItem.heght * textCntentItem.textAdvanceScale;
      }
      textCntent.tem.puh(runBdTranfrm(textCntentItem));
      textCntentItem.ntlzed = fale;
      textCntentItem.tr.length = 0;
    }
    functn enqueueChunk(batch = fale) {
      cnt length = textCntent.tem.length;
      f (length === 0) {
        return;
      }
      f (batch && length < TEXT_CHUNK_BATCH_SIZE) {
        return;
      }
      nk.enqueue(textCntent, length);
      textCntent.tem = [];
      textCntent.tyle = Object.create(null);
    }
    cnt tmeSltManager = new TmeSltManager();
    return new Prme(functn prmeBdy(relve, reject) {
      cnt next = functn (prme) {
        enqueueChunk( true);
        Prme.all([prme, nk.ready]).then(functn () {
          try {
            prmeBdy(relve, reject);
          } catch (ex) {
            reject(ex);
          }
        }, reject);