QR code flickers on resize of the window

[kinafu]

Bug description

When resizing the QR code window, the QR code doesn't scale smoothly.

Show animated gif

System

Operating system and version: Windows 10
Browser and version: Firefox 82.03 (latest at the moment)
Add-on version: 1.7

[dvergeylen]

I'm experiencing the same problem on Firefox 78.3.0esr (64 bits) on Debian. Same Add-on version (1.7).

[rugk]

Hmm, strange. Tested with the same versions on Windows and cannot reproduce it. On Linux rezising was really slow, actually. But yeah, there is definitively something wrong there... And the code for that part is quite complex, unfortunately.