Attach (recommended) or Link to PDF file here:
[Test file.pdf](https://github.com/mozilla/pdf.js/files/4656226/Test.file.pdf)

Configuration:
- Web browser and its version: Chrome Version 81.0.4044.138 (Official Build) (64-bit)
- Operating system and its version: Windows 10
- PDF.js version: latest
- Is a browser extension: no

Steps to reproduce the problem:
1. Open [https://mozilla.github.io/pdf.js/web/viewer.html](https://mozilla.github.io/pdf.js/web/viewer.html)
2. Load the provided .pdf file

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/5569382/82438616-02c3fe80-9aa2-11ea-9003-b75ea1e7aac6.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/5569382/82438640-09527600-9aa2-11ea-810b-071da7e37896.png)


if (font.disableFontFace || patternFill) {
        ctx.save();
        ctx.translate(x, y);
        ctx.beginPath();
        addToPath(ctx, fontSize);
        if (patternTransform) {
          ctx.setTransform.apply(ctx, patternTransform);
        }
        if (
          fillStrokeMode === TextRenderingMode.FILL ||
          fillStrokeMode === TextRenderingMode.FILL_STROKE
        ) {
          ctx.fill();
        }
        if (
          fillStrokeMode === TextRenderingMode.STROKE ||
          fillStrokeMode === TextRenderingMode.FILL_STROKE
        ) {
          if (resetLineWidthToOne) {
            ctx.resetTransform();
            ctx.lineWidth = Math.round(this._combinedScaleFactor);
          }
          ctx.stroke();
        }
        ctx.restore();
      } else {
        if (
          fillStrokeMode === TextRenderingMode.FILL ||
          fillStrokeMode === TextRenderingMode.FILL_STROKE
        ) {