Move ManuallySized to a separate module.

Purpose: allow it to be used both for static and animated diagrams.

ihaskell-display/ihaskell-diagrams/IHaskell/Display/Diagrams.hs

@@ -1,5 +1,4 @@
 {-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}
-{-# LANGUAGE DeriveFunctor, DeriveGeneric #-}
 
 module IHaskell.Display.Diagrams
          ( diagram, animation
@@ -12,14 +11,7 @@ import           Diagrams.Backend.Cairo
 import           Diagrams.Prelude
 import           IHaskell.Display
 import           IHaskell.Display.Diagrams.Animation
-
-import           GHC.Generics (Generic)
-
-data ManuallySized a = ManuallySized
-    { contentToDisplay :: a
-    , imgManualWidth :: Double
-    , imgManualHeight :: Double
-    } deriving (Show, Functor, Generic)
+import           IHaskell.Display.Diagrams.ImgSize
 
 instance IHaskellDisplay (ManuallySized (QDiagram Cairo V2 Double Any)) where
   display renderable = do

ihaskell-display/ihaskell-diagrams/IHaskell/Display/Diagrams/ImgSize.hs

@@ -0,0 +1,11 @@
+{-# LANGUAGE DeriveFunctor, DeriveGeneric #-}
+
+module IHaskell.Display.Diagrams.ImgSize where
+
+import           GHC.Generics (Generic)
+
+data ManuallySized a = ManuallySized
+    { contentToDisplay :: a
+    , imgManualWidth :: Double
+    , imgManualHeight :: Double
+    } deriving (Show, Functor, Generic)

ihaskell-display/ihaskell-diagrams/ihaskell-diagrams.cabal

@@ -52,6 +52,7 @@ library
   
   -- Modules included in this library but not exported.
   other-modules:       IHaskell.Display.Diagrams.Animation
+                       IHaskell.Display.Diagrams.ImgSize
   
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6 && <5,