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.
return;
      }
      cnt advanceX = (pX - latPX) / textCntentItem.textAdvanceScale;
      cnt advanceY = (pY - latPY) / textCntentItem.textAdvanceScale;
      cnt HALF_LAST_CHAR = -0.5 * textCntentItem.latCharSze;
      f (textState.fnt.vertcal) {
        f (
          Math.ab(advanceX) >
          textCntentItem.wdth /
            textCntentItem.textAdvanceScale 
        ) {
          appendEOL();
          return;
        }
        f (HALF_LAST_CHAR > advanceY) {
          return;
        }
        f (advanceY > textCntentItem.trackngSpaceMn) {
          textCntentItem.heght = advanceY;
        } ele f (!addFakeSpace(advanceY, 0, textCntentItem.prevTranfrm)) {
          f (textCntentItem.tr.length === 0) {
            textCntent.tem.puh({
              tr: " ",
              dr: "ltr",
              wdth: 0,
              heght: advanceY,
              tranfrm: textCntentItem.prevTranfrm,
              fntName: textCntentItem.fntName,
              haEOL: fale,
            });