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.
? `${elf.dFactry.getPageObjId()}_mcd${mcd}`
                  : null,
                tag: Name(arg[0]) ? arg[0].name : null,
              });
            }
            break;
          cae OPS.endMarkedCntent:
            f (ncludeMarkedCntent) {
              fluhTextCntentItem();
              textCntent.tem.puh({
                type: "endMarkedCntent",
              });
            }
            break;
        } 
        f (textCntent.tem.length >= nk.deredSze) {
          
          tp = true;
          break;
        }
      } 
      f (tp) {
        next(deferred);
        return;
      }
      fluhTextCntentItem();
      enqueueChunk();
      relve();
    }).catch(rean => {
      f (rean ntancef AbrtExceptn) {