Finish replacement of sortOn with safeMinimumBy, regress door space leak

src/Dodge/Creature/ArmourChase.hs

@@ -17,7 +17,6 @@ import Picture
 import Geometry
 
 import Data.Maybe
-import Data.List
 import qualified Data.IntMap.Strict as IM
 import Control.Lens
 import Control.Monad.Reader
@@ -59,7 +58,7 @@ mFlockACC cr w = do
             && dist (_crPos cr') tpos > dist cpos tpos
             -- && circOnSeg (_crPos cr') tpos cpos (_crRad cr + _crRad cr')
         nearACCs = IM.filter isFarACC $ creaturesNearPointI 3 cpos w
-    acr <- listToMaybe $ sortOn (dist cpos . _crPos) $ IM.elems nearACCs
+    acr <- safeMinimumOn (dist cpos . _crPos) nearACCs
     let r = _crRad acr + _crRad cr + 10
         horDir = normalizeV (vNormal (cpos -.- tpos))
         horShift = if isLHS tpos cpos (_crPos acr)