Add ModifySpacing message handling to SmartPacing and SmartSpacingWithEdge

CHANGES.md

@@ -4,6 +4,8 @@
 
 ### Breaking Changes
 
+  * Adding handling of modifySpacing message in smartSpacing and smartSpacingWithEdge layout modifier
+
   * `XMonad.Actions.GridSelect`
 
     - Added field `gs_bordercolor` to `GSConfig` to specify border color.

XMonad/Layout/Spacing.hs

@@ -107,6 +107,10 @@ instance LayoutModifier SmartSpacing a where
     pureModifier _ _ _ [x] = ([x], Nothing)
     pureModifier (SmartSpacing p) _ _ wrs = (map (second $ shrinkRect p) wrs, Nothing)
 
+    pureMess (SmartSpacing px) m
+     | Just (ModifySpacing f) <- fromMessage m = Just $ SmartSpacing $ max 0 $ f px
+     | otherwise = Nothing
+
     modifierDescription (SmartSpacing p) = "SmartSpacing " ++ show p
 
 -- | Surrounds all windows with blank space, and adds the same amount of spacing
@@ -126,4 +130,8 @@ instance LayoutModifier SmartSpacingWithEdge a where
         | maybe False (\s -> null (up s) && null (down s)) (stack w) = runLayout w r
         | otherwise = runLayout w (shrinkRect p r)
 
+    pureMess (SmartSpacingWithEdge px) m
+     | Just (ModifySpacing f) <- fromMessage m = Just $ SmartSpacingWithEdge $ max 0 $ f px
+     | otherwise = Nothing
+
     modifierDescription (SmartSpacingWithEdge p) = "SmartSpacingWithEdge " ++ show p