This is a nice addition, thanks!

• I didn't experience any wiggling, it's silky smooth for me still
• Not sure whether the hardcoded 320px restriction in the GalleryItem is what's always desired, but I'm not sure what would be better. It's okay for now though. But maybe you have any other ideas?

I made it work in real time (related to our state management using MobX, components using stores need to be explicitly observed), and also added it as a context menu option:

These are the changes:
upscale-filter.patch

I didn't experience any wiggling, it's silky smooth for me still

You're right, looks like the rendering bug has been fixed in electron.

Not sure whether the hardcoded 320px restriction in the GalleryItem is what's always desired, but I'm not sure what would be better. It's okay for now though. But maybe you have any other ideas?

That's a general use approximation. Ideally you'd want to use the pixelated upscale filter only when you're magnifying something by >= 2, so it would depend on the container size and thumbnail size.

Thanks for the quick response! And sorry this has been catching dust for a while, it's much appreciated 😃

I'm gonna get it released this weekend 👍