Side-by-side image viewer with synchronized zoom and sliding overlays. Drag and drop to instantly compare multiple images on your desktop. Very open source.
Fit images (if they have not yet been panned or zoomed**)
*Filename visibility is to become independent of interface visibility when #68 is implemented.
**Why? Because it is more intuitive that a user who has directly gone fullscreen after having added images would like to have those images fit fully in their screen.
From https://github.com/olive-groves/butterfly_viewer/issues/68#issuecomment-2293695175.
Going fullscreen should:
*Filename visibility is to become independent of interface visibility when #68 is implemented.
**Why? Because it is more intuitive that a user who has directly gone fullscreen after having added images would like to have those images fit fully in their screen.