make sure Shadow X11 property is not set on decorated windows, since it is handled by

the decoration itself (and therefore should not be by kwin).

clients/oxygen/oxygenclient.cpp

@@ -42,8 +42,12 @@
 #include <QtGui/QLabel>
 #include <QtGui/QPainter>
 #include <QtGui/QBitmap>
+#include <QtGui/QX11Info>
 #include <QtCore/QObjectList>
 
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+
 namespace Oxygen
 {
 
@@ -59,7 +63,8 @@ namespace Oxygen
         _forceActive( false ),
         _mouseButton( Qt::NoButton ),
         _itemData( this ),
-        _sourceItem( -1 )
+        _sourceItem( -1 ),
+        _shadowAtom( 0 )
     {}
 
     //___________________________________________
@@ -167,6 +172,9 @@ namespace Oxygen
 
         } else if( hasSizeGrip() ) deleteSizeGrip();
 
+        // needs to remove shadow property on window since shadows are handled by the decoration
+        removeShadowHint();
+
     }
 
     //___________________________________________
@@ -1827,4 +1835,18 @@ namespace Oxygen
         _sizeGrip = 0;
     }
 
+    //_________________________________________________________________
+    void Client::removeShadowHint( void )
+    {
+
+        // do nothing if no window id
+        if( !windowId() ) return;
+
+        // create atom
+        if( !_shadowAtom )
+        { _shadowAtom = XInternAtom( QX11Info::display(), "_KDE_NET_WM_SHADOW", False); }
+
+        XDeleteProperty(QX11Info::display(), windowId(), _shadowAtom);
+    }
+
 }

clients/oxygen/oxygenclient.h

@@ -41,6 +41,7 @@
 #include <QtCore/QTextStream>
 #include <QtCore/QTimerEvent>
 
+#include <X11/Xdefs.h>
 
 namespace Oxygen
 {
@@ -398,6 +399,9 @@ namespace Oxygen
 
         //@}
 
+        //! remove shadow hint
+        void removeShadowHint( void );
+
         protected slots:
 
         //! set target item to -1
@@ -459,6 +463,9 @@ namespace Oxygen
         */
         QBasicTimer _dragStartTimer;
 
+        //! shadow atom
+        Atom _shadowAtom;
+
     };
 
 } // namespace Oxygen