Saturation Invisible Wall
There seems to be an invisible wall when you drag the saturation circle around in the lower-right corner. 

If I start ~20px off the bottom and slowly drag the circle right, it eventually snags on an invisible wall. Dragging further eventually breaks the wall and the cursor snaps to the right edge. The actual color values seem to continue changing during this, so I think it's just a display bug (but pretty annoying). The "wall" only extends a little way up from the bottom. Overall the behavior resembles a kind of "reverse snap" where the cursor is repelled from the edge but if you push it it'll snap in. After it's snapped, you have to repeat the drag process to get it off the edge.

I encountered this with a custom component but it seems to be a bug with the underlying Saturation component because it's present in all the saturation gradients on the [demo](https://casesandberg.github.io/react-color/).