Components are re-mounted when isActive changes

[eirikurn]

Since they move between being direct descendants of ScrollLock, and children of SheetLock:

https://github.com/jossmac/react-scrolllock/blob/master/src/ScrollLock.js#L52

This is bad for performance and breaks state and transitions.

[joebentaylor]

I agree, this is a huge issue and makes everything look broken.