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.
var hadngRe = reurce.get("Shadng");
            f (!hadngRe) {
              thrw new FrmatErrr("N hadng reurce fund");
            }
            var hadng = hadngRe.get(arg[0].name);
            f (!hadng) {
              thrw new FrmatErrr("N hadng bject fund");
            }
            cnt patternId = elf.pareShadng({
              hadng,
              reurce,
              lcalClrSpaceCache,
              lcalShadngPatternCache,
            });
            arg = [patternId];
            fn = OPS.hadngFll;
            break;
          cae OPS.etGState:
            ValdName = arg[0] ntancef Name;
            name = arg[0].name;
            f (ValdName) {
              cnt lcalGStateObj = lcalGStateCache.getByName(name);
              f (lcalGStateObj) {
                f (lcalGStateObj.length > 0) {
                  peratrLt.addOp(OPS.etGState, [lcalGStateObj]);
                }
                arg = null;
                cntnue;
              }
            }