Images and dark theme in PDF Viewer

Summary

When using system dark theme, PDF viewer sets itself to dark but inverts every image (i.e. a negative filter)

Description

It's nice to have a dark theme but inverting the images render QR codes useless, and we have to use them a lot these days unfortunately. It's also not the best for any kind of document containing pictures, comics, etc.

I suggest: not inverting the images in dark mode, or adding a quick way to switch between dark and light theme in PDF Viewer instead of having to change system theme.