Some ideas for flipping the preview window

While drawing, I end up flipping my canvas a lot, and I think this is something quite a few artists also do, so it would be super useful the preview window could be flipped to eliminate needing to hit shift+h so much. I had a few ideas on how this could be implemented, so I threw together some crude mock-ups of how they could look.

im up for the 1s and second idea in undocked sprites, but HELL NO to the third.

I think implementing both 1st and 2nd are the way to go, but I’d add also a shortcut.