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.
phraseSearch: false,
      },
      matchesPerPage: [0, 0, 0, 0, 0, 1, 0, 0, 4, 0, 0, 0, 0, 0],
      selectedMatch: {
        pageIndex: 5,
        matchIndex: 0,
      },
    });
  });
  it("performs a normal search, where the text is normalized", async function () {
    const { eventBus, pdfFindController } = await initPdfFindController(
      "fraction-highlight.pdf"
    );
    await testSearch({
      eventBus,
      pdfFindController,
      state: {
        query: "fraction",
      },
      matchesPerPage: [3],
      selectedMatch: {
        pageIndex: 0,
        matchIndex: 0,
      },
      pageMatches: [[19, 48, 66]],
      pageMatchesLength: [[8, 8, 8]],
    });
  });
});