Set WM_STATE, iconify invisible windows (+9 loc)

Note that this breaks compatibility with certain programs described as
"obsolete" in the ICCCM (1994).  See the command above the UnmapEvent handler
for details.

Main.hs

@@ -144,12 +144,23 @@ handle (KeyEvent {ev_event_type = t, ev_state = m, ev_keycode = code})
 -- manage a new window
 handle (MapRequestEvent    {ev_window = w}) = withDisplay $ \dpy -> do
     wa <- io $ getWindowAttributes dpy w -- ignore override windows
-    when (not (wa_override_redirect wa)) $ manage w
+    -- need to ignore mapping requests by managed windows not on the current workspace
+    managed <- isClient w
+    when (not (wa_override_redirect wa) && not managed) $ do manage w
 
 -- window destroyed, unmanage it
 -- window gone,      unmanage it
 handle (DestroyWindowEvent {ev_window = w}) = whenX (isClient w) $ unmanage w
-handle (UnmapEvent         {ev_window = w}) = whenX (isClient w) $ unmanage w
+
+-- We only handle synthetic unmap events, because real events are confusable
+-- with the events produced by 'hide'.  ICCCM says that all clients should send
+-- synthetic unmap events immediately after unmapping, and later describes
+-- clients that do not follow the rule as "obsolete".  For now, we make the
+-- simplifying assumption that nobody uses clients that were already obsolete
+-- in 1994.  Note that many alternative methods for resolving the hide/withdraw
+-- ambiguity are racy.
+
+handle (UnmapEvent         {ev_window = w, ev_send_event = True}) = whenX (isClient w) $ unmanage w
 
 -- set keyboard mapping
 handle e@(MappingNotifyEvent {ev_window = w}) = do

Operations.hs

@@ -61,7 +61,7 @@ manage w = withDisplay $ \d -> do
 -- there, floating status is lost when moving windows between workspaces,
 -- because W.shift calls W.delete.
 unmanage :: Window -> X ()
-unmanage w = windows $ W.sink w . W.delete w
+unmanage w = setWMState w 0{-withdrawn-} >> windows (W.sink w . W.delete w)
 
 -- | focus. focus window up or down. or swap various windows.
 focusUp, focusDown, swapUp, swapDown, swapMaster :: X ()
@@ -133,11 +133,20 @@ windows f = do
  where integrate W.Empty        = []
        integrate (W.Node x l r) = x : l ++ r
 
--- | hide. Hide a window by moving it off screen.
+-- | setWMState.  set the WM_STATE property
+setWMState :: Window -> Int -> X ()
+setWMState w v = withDisplay $ \dpy -> do
+    a <- atom_WM_STATE
+    io $ changeProperty32 dpy w a a propModeReplace [fromIntegral v, fromIntegral none]
+
+-- | hide. Hide a window by unmapping it.
+--
+-- If you call this on a window that is marked as visible, very bad things will
+-- happen (currently unmanaging, but don't count on it).
 hide :: Window -> X ()
 hide w = withDisplay $ \d -> do
-    (sw,sh) <- gets dimensions
-    io $ moveWindow d w sw sh
+    io $ unmapWindow d w
+    setWMState w 3 --iconic
 
 -- | refresh. Render the currently visible workspaces, as determined by
 -- the StackSet. Also, set focus to the focused window.
@@ -164,14 +173,14 @@ refresh = do
         rs <- doLayout l (Rectangle
                 (sx + fromIntegral gl)        (sy + fromIntegral gt)
                 (sw - fromIntegral (gl + gr)) (sh - fromIntegral (gt + gb))) tiled
-        mapM_ (\(win,rect) -> io (tileWindow d win rect)) rs
+        mapM_ (\(win,rect) -> tileWindow win rect) rs
 
         -- now the floating windows:
         -- move/resize the floating windows, if there are any
         (`mapM_` flt) $ \fw -> whenJust (M.lookup fw (W.floating ws)) $
           \(W.RationalRect rx ry rw rh) -> do
             let Rectangle px py pw ph = genericIndex xinesc (W.screen w)
-            io $ tileWindow d fw $ Rectangle
+            tileWindow fw $ Rectangle
                 (px + floor (toRational pw*rx)) (py + floor (toRational ph*ry))
                 (floor (toRational pw*rw)) (floor (toRational ph*rh))
 
@@ -209,11 +218,14 @@ clearEnterEvents = withDisplay $ \d -> io $ do
 
 -- | tileWindow. Moves and resizes w such that it fits inside the given
 -- rectangle, including its border.
-tileWindow :: Display -> Window -> Rectangle -> IO ()
-tileWindow d w r = do
-    bw <- (fromIntegral . wa_border_width) `liftM` getWindowAttributes d w
-    moveResizeWindow d w (rect_x r) (rect_y r)
-                         (rect_width  r - bw*2) (rect_height r - bw*2)
+tileWindow :: Window -> Rectangle -> X ()
+tileWindow w r = withDisplay $ \d -> do
+    bw <- (fromIntegral . wa_border_width) `liftM` io (getWindowAttributes d w)
+    io $ moveResizeWindow d w (rect_x r) (rect_y r)
+                              (rect_width  r - bw*2) (rect_height r - bw*2)
+    -- this is harmless if the window was already visible
+    setWMState w 1 --normal
+    io $ mapWindow d w
 
 -- ---------------------------------------------------------------------
 

XMonad.hs

@@ -18,7 +18,8 @@
 module XMonad (
     X, WindowSet, WorkspaceId(..), ScreenId(..), XState(..), XConf(..), Layout(..),
     Typeable, Message, SomeMessage(..), fromMessage, atom_WM_PROTOCOLS, atom_WM_DELETE_WINDOW,
-    runX, io, withDisplay, withWindowSet, isRoot, spawn, restart, trace, whenJust, whenX
+    runX, io, withDisplay, withWindowSet, isRoot, spawn, restart, trace, whenJust, whenX,
+    atom_WM_STATE
   ) where
 
 import StackSet (StackSet)
@@ -95,9 +96,10 @@ getAtom :: String -> X Atom
 getAtom str = withDisplay $ \dpy -> io $ internAtom dpy str False
 
 -- | Common non-predefined atoms
-atom_WM_PROTOCOLS, atom_WM_DELETE_WINDOW :: X Atom
+atom_WM_PROTOCOLS, atom_WM_DELETE_WINDOW, atom_WM_STATE :: X Atom
 atom_WM_PROTOCOLS       = getAtom "WM_PROTOCOLS"
 atom_WM_DELETE_WINDOW   = getAtom "WM_DELETE_WINDOW"
+atom_WM_STATE           = getAtom "WM_STATE"
 
 ------------------------------------------------------------------------
 -- Layout handling