It this window manager Mir?

Property definitions

sdl2 $ SDLSysWMInfo :: is_mir
	# It this window manager Mir?
	fun is_mir: Bool `{
		#if SDL_VERSION_ATLEAST(2, 0, 3)
			return self->subsystem == SDL_SYSWM_MIR;
		#else
			return 0;
		#endif
	`}
lib/sdl2/syswm.nit:75,2--82,3