Unconnected ways can't be flipped/mirrored

[JamesKingdom]

I was trying to flip a semicircle in order to create an accurate running track, but because the ways are not connected, it won't let you flip

Unconnected

Connected

[bhousel]

I relaxed the rules a bit. The old rules required some of the geometry to be closed areas, but really the math will work if:

• Rotation requires at least 2 unique nodes in selectedIDs
• Reflection requires at least 3 unique nodes in selectedIDs

This means now you can do reflections and rotations on lines and groups of points: