Implement KDecorationBridge unstable API, needed for KDE 4.2.
---

diff --git a/kde/window-decorator-kde4/window.cpp b/kde/window-decorator-kde4/window.cpp
index d2d362b..68c856b 100644
--- a/kde/window-decorator-kde4/window.cpp
+++ b/kde/window-decorator-kde4/window.cpp
@@ -764,6 +764,31 @@ KWD::Window::grabXServer (bool)
 }
 
 void
+KWD::Window::repaintShadow (void)
+{
+}
+
+bool
+KWD::Window::compositingActive (void) const
+{
+    return true;
+}
+
+bool
+KWD::Window::shadowsActive (void) const
+{
+    /* we are drawing the shadows ourselves, no need for the
+       decoration engine to do so */
+    return false;
+}
+
+double
+KWD::Window::opacity (void) const
+{
+    return 1.0;
+}
+
+void
 KWD::Window::createDecoration (void)
 {
     KDecoration *decor;
diff --git a/kde/window-decorator-kde4/window.h b/kde/window-decorator-kde4/window.h
index bdf2c47..034e6fe 100644
--- a/kde/window-decorator-kde4/window.h
+++ b/kde/window-decorator-kde4/window.h
@@ -45,7 +45,7 @@ class QMenu;
 
 namespace KWD
 {
-class Window:public QWidget, public KDecorationBridge {
+class Window:public QWidget, public KDecorationBridgeUnstable {
     Q_OBJECT public:
 
 	enum Type
@@ -104,6 +104,12 @@ class Window:public QWidget, public KDecorationBridge {
 	virtual Qt::WFlags initialWFlags (void) const;
 	virtual void grabXServer (bool grab);
 
+	/* unstable API */
+	virtual void repaintShadow ();
+	virtual bool compositingActive () const;
+	virtual bool shadowsActive () const;
+	virtual double opacity () const;
+
 	void handleActiveChange (void);
 	void updateFrame (WId frame);
 	void updateWindowGeometry (void);