Attach (recommended) or Link to PDF file here: The live demo: https://mozilla.github.io/pdf.js/web/viewer.html

Configuration:

• Web browser and its version: FireFox and Chrome tested
• Operating system and its version:
• PDF.js version: The latest one (4.0.379)
• Is a browser extension: No

Steps to reproduce the problem:

1. Open the live demo https://mozilla.github.io/pdf.js/web/viewer.html
2. click the Draw toolbar
3. Draw a line on the viewer (any line on any place)
4. Okay. here is the problem. I want to create another line but I press and hold Shift or Ctrl key on my keyboard then tried to draw the new line with my mouse. Suddenly the drawn line is selected with additional straight line in it. Also I can't remove them.

What is the expected behavior?
I expect the pressed Shift/Ctrl key can make a straight line instead of the free/bezier line (if it's possible to create a straight line with the key combination).

What went wrong?
The drawn line is selected with additional straight line in it. Also I can't remove them. pls check this screen