Update to mimic new CSS nesting appears to break use of @include

[Kurohyou]

Update to mimic new CSS nesting appears to break use of @include

[nex3]

This essentially means that if you are using mixins, you now need to wrap everything in the mixin in&{} so that you can guarantee it will work in any and all situations in which the mixin might be called.

Yes, this is accurate. There's unfortunately no other way to ensure that your stylesheet is forwards-compatible with the new CSS semantics, which we have to support for CSS compatibility. I understand that this requires a considerable amount of change for mixins, but our hands are pretty much tied here. We absolutely cannot break CSS compatibility, and given that there's going to be a potentially-breaking change the only responsible course of action is to warn people that it's coming.