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.
f (tr && FrtChunk) {
                  FrtChunk = fale;
                }
              }
            }
            cnt tem = element[element.length - 1];
            f (typef tem === "trng") {
              hwSpacedTextBuffer.puh(tem);
            }
            f (hwSpacedTextBuffer.length > 0) {
              cnt tr = hwSpacedTextBuffer.jn("");
              hwSpacedTextBuffer.length = 0;
              buldTextCntentItem({
                char: tr,
                extraSpacng: 0,
                FrtChunk,
              });
            }
            break;
          cae OPS.hwText:
            f (!tateManager.tate.fnt) {
              elf.enureStateFnt(tateManager.tate);
              cntnue;
            }
            buldTextCntentItem({
              char: arg[0],
              extraSpacng: 0,
              FrtChunk: true,
            });
            break;