allow mouse to change current workspace

StackSet.hs

@@ -163,11 +163,11 @@ delete k w = maybe w tweak (M.lookup k (cache w))
                     , focus  = M.update (\k' -> if k == k' then elemAfter k (stacks w M.! i) else Just k') i (focus w) }
 
 -- | /O(log n)/. If the given window is contained in a workspace, make it the
--- focused window of that workspace.
+-- focused window of that workspace, and make that workspace the current one.
 raiseFocus :: Ord a => a -> StackSet a -> StackSet a
 raiseFocus k w = case M.lookup k (cache w) of
     Nothing -> w
-    Just i  -> w { focus = M.insert i k (focus w) }
+    Just i  -> w { focus = M.insert i k (focus w), current = i }
 
 -- | Move a window to the top of its workspace.
 promote :: Ord a => a -> StackSet a -> StackSet a

TODO

@@ -25,8 +25,5 @@
     - change focus in the StackSet structure on EnterNotify
     - let mod+enter demote a master window
     - borders (low priority, maybe wait until 0.2)
-    - let focus-follows-mouse also change the active workspace (not just the
-      active window); note that this currently also makes click-to-focus appear
-      slightly buggy, since sometimes, the wrong window is exempted from setButtonGrab
 
 * Tile vertically/ resize height.