Pixelate and blur tool not updated correctly with screen scaling

[DamirPorobic]

Can you elaborate on that? Maybe that is another issue?

https://user-images.githubusercontent.com/24500411/144763380-8849bafb-e32b-4eb3-b1ba-0045aa72e26b.mp4

I took this video of the same image fullscreened on both of my screens. I was dragging a small pixel box around.

Originally posted by @gubareve in https://github.com/ksnip/ksnip/issues/276#issuecomment-986297741