Please give the update of Image Juxtaposition a UX review (not sure if it's really required, as UX is essentially the same, You know where to find the updated version for testion) a code review, and release it.
UX is fine
Code is fine
I finally managed to give Image Juxtaposition a complete overhaul. There's not much left of the original code (but I kept the messy CSS class names in order to not mess with customization unless you think I could safely change them). It now uses the usual build chain, now all my content types are jQuery-free, the code is split into several classes, the code has been refactored, ... Now I don't have to be ashamed of the code anymore
Has a loading spinner which is useful for high resolution images/small bandwidth
Allows to set the color of the handle to adjust it to the background colors
Offers a fullscreen mode
Comes with new translations: Greek (found in e-me's fork) and Finnish (contributed by Jarvil)
Resizing is now fine, so using Juxtaposition without the action bar works, and it could be included in Column as well (tested)
Images now can have an ALT tag (when upgrading, the previous label (if present) will be used for the ALT tag, so Juxtaposition should now be accessible - although there's not much purpose using the handle to slide from one image to the other.
There was a 1 pixel offset between both images that's gone now.