[oekaki] layer group flipping

[hypnowave]

please i put like 57384 layers into a single group folder i can't afford to flip them all

(if this suggestion actually gains traction i'll edit/formalize this post, but you know. i want what it says on the tin.)

[JK341]

Oh gosh major support on this! I ran into this exact dilemma just the other day! I did discover that you can duplicate entire group folders, so the ability to flip an entire group folder would be nifty as well! c: