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.
}
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    let angleCos = 1,
      angleSin = 0;
    if (angle !== 0) {
      angleCos = Math.cos(angle);
      angleSin = Math.sin(angle);
    }
    const divWidth =
      (style.vertical ? geom.height : geom.width) * task._viewport.scale;
    const divHeight = fontHeight;
    let m, b;
    if (angle !== 0) {
      m = [angleCos, angleSin, -angleSin, angleCos, left, top];
      b = Util.getAxialAlignedBoundingBox([0, 0, divWidth, divHeight], m);
    } else {
      b = [left, top, left + divWidth, top + divHeight];
    }
    task._bounds.push({
      left: b[0],
      top: b[1],
      right: b[2],
      bottom: b[3],
      div: textDiv,
      size: [divWidth, divHeight],
      m,
    });
  }
}
function render(task) {