add display for all platforms

src/Makie.jl

@@ -43,12 +43,23 @@ const NT = Theme
 export NT
 
 const has_ffmpeg = Ref(false)
+
+struct MakieDisplay <: Display
+end
+
+# Hacky workaround, for the difficulty of removing closed screens from the display stack
+# So we just leave the makiedisplay on stack, and then just get the singleton gl display for now!
+function Base.display(::MakieDisplay, scene::Scene)
+    display(global_gl_screen(), scene)
+end
+
 function __init__()
     has_ffmpeg[] = try
         success(`ffmpeg -h`)
     catch
         false
     end
+    pushdisplay(MakieDisplay())
 end
 
 function logo()