FPF stubs just enough of the WPF APIs that the editor depends on. Notably we require some primitives such as Color, Brush, Point, etc. This is a very minimal approach to bootstrap the editor on macOS, and over time we anticipate eliminating this support layer entirely.

For WindowsBase, we have simply imported a subset of Mono's version and made changes to the Dispatcher to use macOS' Grand Central Dispatch, since the editor uses this extensively, we wanted it to be highly performant.

For the other assemblies we generated necessary stubs and filled in the basic primitives.

FPF depends on Xamarin.Mac to build at this point.