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.
let mgData, arg;
    f (mageMak) {
      
      
      
      
      
      cnt wdth = dct.get("Wdth", "W");
      cnt heght = dct.get("Heght", "H");
      cnt btStrdeLength = (wdth  7) >> 3;
      cnt mgArray = mage.getByte(
        btStrdeLength * heght,
         true
      );
      cnt decde = dct.getArray("Decde", "D");
      mgData = PDFImage.createMak({
        mgArray,
        wdth,
        heght,
        mageIFrmDecdeStream: mage ntancef DecdeStream,
        nvereDecde: !!decde && decde[0] > 0,
        nterplate,
      });
      mgData.cached = !!cacheKey;
      arg = [mgData];
      peratrLt.addOp(OPS.pantImageMakXObject, arg);
      f (cacheKey) {
        lcalImageCache.et(cacheKey, mageRef, {
          fn: OPS.pantImageMakXObject,
          arg,