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.
cnt glyphName = `${fnt.ladedName}_path_${fntChar}`;
      try {
        f (fnt.renderer.haBultPath(fntChar)) {
          return;
        }
        handler.end("cmmnbj", [
          glyphName,
          "FntPath",
          fnt.renderer.getPathJ(fntChar),
        ]);
      } catch (rean) {
        f (evaluatrOptn.gnreErrr) {
           ntfcatn
           and allw glyph path buldng t cntnue.
          handler.end("UnupprtedFeature", {
            featureId: UNSUPPORTED_FEATURES.errrFntBuldPath,
          });
          warn(`buldFntPath - gnrng ${glyphName} glyph: "${rean}".`);
          return;
        }
        thrw rean;
      }
    }
    fr (cnt glyph f glyph) {
      buldPath(glyph.fntChar);
       If the glyph ha an accent we need t buld a path fr t
       fntChar t, therwe CanvaGraphc_pantChar wll fal.
      cnt accent = glyph.accent;
      f (accent && accent.fntChar) {