Iconification using _NET_WM_STATE_HIDDEN hint if supported by WM

If the Window Manager supports the _NET_WM_STATE_HIDDEN, we use it to use
the _NET_WM_STATE protocol when de-iconifying windows (iconification is
unchanged, via XIconifyWindow). Additionally, we no longer interpret all
UnmapNotify events for our window as the result of iconification.

(Based on patch by Tomas Frydrych <tf@linux.intel.com>)

gdk/x11/gdkevents-x11.c

@@ -477,6 +477,21 @@ do_net_wm_state_changes (GdkWindow *window)
                                      0,
                                      GDK_WINDOW_STATE_MAXIMIZED);
     }
+
+  if (old_state & GDK_WINDOW_STATE_ICONIFIED)
+    {
+      if (!toplevel->have_hidden)
+        gdk_synthesize_window_state (window,
+                                     GDK_WINDOW_STATE_ICONIFIED,
+                                     0);
+    }
+  else
+    {
+      if (toplevel->have_hidden)
+        gdk_synthesize_window_state (window,
+                                     0,
+                                     GDK_WINDOW_STATE_ICONIFIED);
+    }
 }
 
 static void
@@ -534,6 +549,7 @@ gdk_check_wm_state_changed (GdkWindow *window)
   toplevel->have_maxvert = FALSE;
   toplevel->have_maxhorz = FALSE;
   toplevel->have_fullscreen = FALSE;
+  toplevel->have_hidden = FALSE;
 
   type = None;
   gdk_error_trap_push ();
@@ -549,6 +565,7 @@ gdk_check_wm_state_changed (GdkWindow *window)
       Atom maxvert_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_MAXIMIZED_VERT");
       Atom maxhorz_atom	= gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_MAXIMIZED_HORZ");
       Atom fullscreen_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_FULLSCREEN");
+      Atom hidden_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_HIDDEN");
 
       atoms = (Atom *)data;
 
@@ -563,6 +580,8 @@ gdk_check_wm_state_changed (GdkWindow *window)
             toplevel->have_maxhorz = TRUE;
           else if (atoms[i] == fullscreen_atom)
             toplevel->have_fullscreen = TRUE;
+          else if (atoms[i] == hidden_atom)
+            toplevel->have_hidden = TRUE;
           
           ++i;
         }
@@ -1767,21 +1786,29 @@ gdk_event_translate (GdkDisplay *display,
       event->any.type = GDK_UNMAP;
       event->any.window = window;      
 
-      /* If we are shown (not withdrawn) and get an unmap, it means we
+      /* If the WM supports the _NET_WM_STATE_HIDDEN hint, we do not want to
-       * were iconified in the X sense. If we are withdrawn, and get
+       * interpret UnmapNotify events as implying iconic state.
-       * an unmap, it means we hid the window ourselves, so we
+       * http://bugzilla.gnome.org/show_bug.cgi?id=590726.
-       * will have already flipped the iconified bit off.
        */
-      if (window)
+      if (screen &&
-	{
+          !gdk_x11_screen_supports_net_wm_hint (screen,
-	  if (GDK_WINDOW_IS_MAPPED (window))
+                                                gdk_atom_intern_static_string ("_NET_WM_STATE_HIDDEN")))
-	    gdk_synthesize_window_state (window,
+        {
-					 0,
+          /* If we are shown (not withdrawn) and get an unmap, it means we were
-					 GDK_WINDOW_STATE_ICONIFIED);
+           * iconified in the X sense. If we are withdrawn, and get an unmap, it
+           * means we hid the window ourselves, so we will have already flipped
+           * the iconified bit off.
+           */
+          if (window)
+            {
+              if (GDK_WINDOW_IS_MAPPED (window))
+                gdk_synthesize_window_state (window,
+                                             0,
+                                             GDK_WINDOW_STATE_ICONIFIED);
 
-	  _gdk_xgrab_check_unmap (window, xevent->xany.serial);
+              _gdk_xgrab_check_unmap (window, xevent->xany.serial);
-	}
+            }
-      
+        }
       break;
       
     case MapNotify:

gdk/x11/gdkwindow-x11.c

@@ -1321,6 +1321,14 @@ set_initial_hints (GdkWindow *window)
       ++i;
     }
 
+  if (private->state & GDK_WINDOW_STATE_ICONIFIED)
+    {
+      atoms[i] = gdk_x11_get_xatom_by_name_for_display (display,
+							"_NET_WM_STATE_HIDDEN");
+      ++i;
+      toplevel->have_hidden = TRUE;
+    }
+
   if (i > 0)
     {
       XChangeProperty (xdisplay,
@@ -4023,6 +4031,9 @@ gdk_window_iconify (GdkWindow *window)
       gdk_synthesize_window_state (window,
                                    0,
                                    GDK_WINDOW_STATE_ICONIFIED);
+      gdk_wmspec_change_state (TRUE, window,
+                               gdk_atom_intern_static_string ("_NET_WM_STATE_HIDDEN"),
+                               GDK_NONE);
     }
 }
 
@@ -4047,6 +4058,9 @@ gdk_window_deiconify (GdkWindow *window)
   if (GDK_WINDOW_IS_MAPPED (window))
     {  
       gdk_window_show (window);
+      gdk_wmspec_change_state (FALSE, window,
+                               gdk_atom_intern_static_string ("_NET_WM_STATE_HIDDEN"),
+                               GDK_NONE);
     }
   else
     {
@@ -4054,6 +4068,9 @@ gdk_window_deiconify (GdkWindow *window)
       gdk_synthesize_window_state (window,
                                    GDK_WINDOW_STATE_ICONIFIED,
                                    0);
+      gdk_wmspec_change_state (FALSE, window,
+                               gdk_atom_intern_static_string ("_NET_WM_STATE_HIDDEN"),
+                               GDK_NONE);
     }
 }
 

gdk/x11/gdkwindow-x11.h

@@ -109,6 +109,7 @@ struct _GdkToplevelX11
   guint have_maxvert : 1;       /* _NET_WM_STATE_MAXIMIZED_VERT */
   guint have_maxhorz : 1;       /* _NET_WM_STATE_MAXIMIZED_HORZ */
   guint have_fullscreen : 1;    /* _NET_WM_STATE_FULLSCREEN */
+  guint have_hidden : 1;	/* _NET_WM_STATE_HIDDEN */
 
   guint is_leader : 1;