https://boersengefluester.de/wp-content/uploads/assets/annuals/2019/578560.pdf

Configuration:
- PDF.js version: 2.7.570

Steps to reproduce the problem:
1. Load the linked PDF
2. On the second page, highlight the word "Mitarbeiterinnen" by double-clicking it

What is the expected behavior?
The word should be recognized as a single word and highlighted as such.

What went wrong?
Instead, it's recognized as 3 words: "Mit", "arbei", "terinnen"
![image](https://user-images.githubusercontent.com/5265630/114384414-f8fe2a80-9b8e-11eb-8843-5099425b0fad.png)

This happens for many words in this PDF.

Is there anything that can be changed in how I use pdfjs-dist to make it recognize this as a single word? Just looking at the PDF, I can't tell what would cause this behavior.

const textDivProperties = this._textDivProperties.get(textDiv);
    let transform = "";
    if (textDivProperties.canvasWidth !== 0 && textDivProperties.hasText) {
      const { fontSize, fontFamily } = textDiv.style;
      
      if (
        fontSize !== this._layoutTextLastFontSize ||
        fontFamily !== this._layoutTextLastFontFamily
      ) {
        this._layoutTextCtx.font = `${fontSize} ${fontFamily}`;
        this._layoutTextLastFontSize = fontSize;
        this._layoutTextLastFontFamily = fontFamily;
      }
      
      const { width } = this._layoutTextCtx.measureText(textDiv.textContent);