What could be improved

In the HasPaint mixin, paint and paintLayers are mutually exclusive. When paintLayers contains paints, paint is ignored when rendering. Similarly, paints in paintLayer have no effect on the component's primary paint.

paint should be considered the first layer in paintLayers. Similarly get and set of paint should point to the first element of paintLayers.

Why should this be improved

It could be confusing to have the component's paint value be ignored after setting layers. paintLayers should not be empty if get, it should contain the current paint as this is a layer being painted. Adding a new paint layer should add onto the current paint, not override it.

Any risks?

No change to the API. No additional memory.

More information

I can submit a PR if the above is agreed. Only minor code changes required.