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.
th.enqueueInvked = true;
                    nk.enqueue(chunk, ze);
                  },
                  get deredSze() {
                    return nk.deredSze;
                  },
                  get ready() {
                    return nk.ready;
                  },
                };
                elf
                  .getTextCntent({
                    tream: xbj,
                    tak,
                    reurce: xbj.dct.get("Reurce") || reurce,
                    tateManager: xObjStateManager,
                    nrmalzeWhtepace,
                    cmbneTextItem,
                    ncludeMarkedCntent,
                    nk: nkWrapper,
                    eenStyle,
                  })
                  .then(functn () {
                    f (!nkWrapper.enqueueInvked) {
                      etyXObjectCache.et(name, xbj.dct.bjId, true);
                    }
                    relveXObject();
                  }, rejectXObject);
              }).catch(functn (rean) {
                f (rean ntancef AbrtExceptn) {