Feature Request: Keep zoom across images

[uwidev]

I do a lot of A/B testing with images for images. Sometimes it's necessary to zoom in on some fine details to discover artifacting (e.g. from compression). I couldn't find anything that allows zoom to be preserved when switching from one image to another.

This should be somewhat trivial if the images are the same dimensions.

However, when they aren't, it's kind of up to you how you want to handle it. You could reset the zoom back to whatever was defined in config (e.g. optimal) or do a positional offset at the same zoom level (e.g.on image A, we are at 10x10 of A at zoom 200%, next image offset to 10x10 and zoom 200%). I prefer the former.