I just posted a video on YouTube and didn't realize until a few days later it was mirrored. I can see the preview mirroring, but saving the images mirrored is dumb. Especially in a video.
The Edit menu isn't the right place for the option. It SHOULD be in preferences, or better yet, right on the app window. And the name of the option doesn't really clearly indicate what it does, or, if you know what it does, which way you'd want it without trying.
Anyway, welcome back from the dead, thread. Guess I'm late to the party.