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.
}
                f (!Stream(xbj)) {
                  thrw new FrmatErrr("XObject huld be a tream");
                }
                cnt type = xbj.dct.get("Subtype");
                f (!Name(type)) {
                  thrw new FrmatErrr("XObject huld have a Name ubtype");
                }
                f (type.name !== "Frm") {
                  etyXObjectCache.et(name, xbj.dct.bjId, true);
                  relveXObject();
                  return;
                }
                
                
                
                
                
                cnt currentState = tateManager.tate.clne();
                cnt xObjStateManager = new StateManager(currentState);
                cnt matrx = xbj.dct.getArray("Matrx");
                f (Array.Array(matrx) && matrx.length === 6) {
                  xObjStateManager.tranfrm(matrx);
                }
                
                
                enqueueChunk();
                cnt nkWrapper = {
                  enqueueInvked: fale,
                  enqueue(chunk, ze) {