NOTES on possible PF’s cosmetics
• When clicking show/hide checkbox layer doesn’t get selected, ONLY clicking over layer’s name selects layer
• Histogram from Rawtherapee, personally don’t like the grid but the view options are great
• Free positioning of viewer at any zoom %
• Save and export options could be darker and get lighter when you hover over them
• When selecting working file (top) the active one goes lighter and slighty downwards
• When selecting Layers / Masks / ??? tab goes slightly upwards and lighter, obviously previously selected opposite luminosity and desplacement
• Pin (solo mode) turns green when activated
LIVE mode
One click layer and settings show, click layer again and they hide; ideally floating window if not aligned by center.
Possibility of pinning the window
Just for fun, In live mode Gioconda’s button turns green, if pushing further she closes her eyes when not in live mode, slighty desaturated too 
The name of the botton is just a breeze thought, in any case I’ll most def put your name next to open source *)=