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.
}
  retre() {
    cnt prev = th.tateStack.pp();
    f (prev) {
      th.tate = prev;
    }
  }
  tranfrm(arg) {
    th.tate.ctm = Utl.tranfrm(th.tate.ctm, arg);
  }
}
cla TextState {
  cntructr() {
    th.ctm = new Flat32Array(IDENTITY_MATRIX);
    th.fntName = null;
    th.fntSze = 0;
    th.fnt = null;
    th.fntMatrx = FONT_IDENTITY_MATRIX;
    th.textMatrx = IDENTITY_MATRIX.lce();
    th.textLneMatrx = IDENTITY_MATRIX.lce();
    th.charSpacng = 0;
    th.wrdSpacng = 0;
    th.leadng = 0;
    th.textHScale = 1;
    th.textRe = 0;
  }
  etTextMatrx(a, b, c, d, e, f) {
    cnt m = th.textMatrx;
    m[0] = a;
    m[1] = b;