Attach (recommended) or Link to PDF file here:
[LesAccentsFrancais(1).pdf](https://github.com/mozilla/pdf.js/files/6369604/LesAccentsFrancais.1.pdf)

Steps to reproduce the problem:
1. Search for "a" and  click on "Highlight All"

What is the expected behavior? (add screenshot)
The two "A" in "FRANÇAIS" must be highlighted

What went wrong? (add screenshot)
They aren't but "R" and "N" are.
![image](https://user-images.githubusercontent.com/5641725/115959448-8f760880-a50c-11eb-9a88-dd14ae3bd6bc.png)

Reproductible in Firefox nightly or in a local dev environment.
jasmineStarted(suiteInfo) {},
    specDone(result) {
      ++results.runs;
      if (result.failedExpectations.length > 0) {
        ++results.failures;
        console.log(`TEST-UNEXPECTED-FAIL | ${result.description}`);
      } else {
        console.log(`TEST-PASSED | ${result.description}`);
      }
    },
    specStarted(result) {},
    suiteDone(result) {},
    suiteStarted(result) {},
  });
  return new Promise(resolve => {
    jasmine.onComplete(resolve);
    jasmine.execute();
  });
}
exports.runTests = runTests;