diff --git a/effects.cpp b/effects.cpp
index f847570fb5..11104adfe8 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -288,11 +288,12 @@ bool EffectsHandlerImpl::borderActivated( ElectricBorder border )
     return ret;
     }
 
-void EffectsHandlerImpl::mouseChanged( const QPoint& pos, const QPoint& old,
-    Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers )
+void EffectsHandlerImpl::mouseChanged( const QPoint& pos, const QPoint& oldpos,
+    Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+    Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers )
     {
     foreach( EffectPair ep, loaded_effects )
-        ep.second->mouseChanged( pos, old, buttons, modifiers );
+        ep.second->mouseChanged( pos, oldpos, buttons, oldbuttons, modifiers, oldmodifiers );
     }
 
 bool EffectsHandlerImpl::grabKeyboard( Effect* effect )
diff --git a/effects.h b/effects.h
index a4aeecfbda..2a10f5b5a1 100644
--- a/effects.h
+++ b/effects.h
@@ -128,8 +128,9 @@ class EffectsHandlerImpl : public EffectsHandler
         void tabBoxClosed();
         void tabBoxUpdated();
         bool borderActivated( ElectricBorder border );
-        void mouseChanged( const QPoint& pos, const QPoint& old,
-            Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers );
+        void mouseChanged( const QPoint& pos, const QPoint& oldpos,
+            Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+            Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers );
         void grabbedKeyboardEvent( QKeyEvent* e );
         bool hasKeyboardGrab() const;
         void propertyNotify( EffectWindow* c, long atom );
diff --git a/effects/demo_taskbarthumbnail.cpp b/effects/demo_taskbarthumbnail.cpp
index 416bba604f..8a26119e90 100644
--- a/effects/demo_taskbarthumbnail.cpp
+++ b/effects/demo_taskbarthumbnail.cpp
@@ -110,7 +110,8 @@ QRect TaskbarThumbnailEffect::getThumbnailPosition( EffectWindow* c, int* space
     return thumb;
     }
 
-void TaskbarThumbnailEffect::mouseChanged( const QPoint& pos, const QPoint&, Qt::MouseButtons, Qt::KeyboardModifiers )
+void TaskbarThumbnailEffect::mouseChanged( const QPoint& pos, const QPoint&,
+    Qt::MouseButtons, Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers )
     {
     // this should check if the mouse position change actually means something
     // (just like it should be done in prePaintScreen()), but since this effect
diff --git a/effects/demo_taskbarthumbnail.h b/effects/demo_taskbarthumbnail.h
index fa19bfa188..db6df45bf6 100644
--- a/effects/demo_taskbarthumbnail.h
+++ b/effects/demo_taskbarthumbnail.h
@@ -45,7 +45,8 @@ class TaskbarThumbnailEffect
         virtual void prePaintWindow( EffectWindow* w, WindowPrePaintData& data, int time );
         virtual void postPaintScreen();
         virtual void mouseChanged( const QPoint& pos, const QPoint& old,
-            Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers );
+            Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+            Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers );
 
     protected:
         QRect getThumbnailPosition( EffectWindow* c, int* space ) const;
diff --git a/effects/lookingglass.cpp b/effects/lookingglass.cpp
index efba8b760e..d0f272b547 100644
--- a/effects/lookingglass.cpp
+++ b/effects/lookingglass.cpp
@@ -124,7 +124,8 @@ void LookingGlassEffect::prePaintScreen( ScreenPrePaintData& data, int time )
     ShaderEffect::prePaintScreen( data, time );
     }
 
-void LookingGlassEffect::mouseChanged( const QPoint& pos, const QPoint& old, Qt::MouseButtons, Qt::KeyboardModifiers )
+void LookingGlassEffect::mouseChanged( const QPoint& pos, const QPoint& old, Qt::MouseButtons,
+    Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers )
     {
     if( pos != old && isEnabled() )
         {
diff --git a/effects/lookingglass.h b/effects/lookingglass.h
index 4a35cdc1e1..5c098ce3a2 100644
--- a/effects/lookingglass.h
+++ b/effects/lookingglass.h
@@ -40,7 +40,8 @@ class LookingGlassEffect : public QObject, public ShaderEffect
         virtual ~LookingGlassEffect();
 
         virtual void mouseChanged( const QPoint& pos, const QPoint& old,
-            Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers );
+            Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+            Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers );
 
         virtual void prePaintScreen( ScreenPrePaintData& data, int time );
 
diff --git a/effects/magnifier.cpp b/effects/magnifier.cpp
index 638e15217a..0b91dd5a88 100644
--- a/effects/magnifier.cpp
+++ b/effects/magnifier.cpp
@@ -160,7 +160,8 @@ void MagnifierEffect::toggle()
     effects->addRepaint( magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
     }
 
-void MagnifierEffect::mouseChanged( const QPoint& pos, const QPoint& old, Qt::MouseButtons, Qt::KeyboardModifiers )
+void MagnifierEffect::mouseChanged( const QPoint& pos, const QPoint& old,
+    Qt::MouseButtons, Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers )
     {
     if( pos != old && zoom != 1 )
         effects->addRepaint( magnifierArea( old ).adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
diff --git a/effects/magnifier.h b/effects/magnifier.h
index a6045df3dc..c78b8cff2e 100644
--- a/effects/magnifier.h
+++ b/effects/magnifier.h
@@ -36,7 +36,8 @@ class MagnifierEffect
         virtual void paintScreen( int mask, QRegion region, ScreenPaintData& data );
         virtual void postPaintScreen();
         virtual void mouseChanged( const QPoint& pos, const QPoint& old,
-            Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers );
+            Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+            Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers );
     private slots:
         void zoomIn();
         void zoomOut();
diff --git a/effects/mousemark.cpp b/effects/mousemark.cpp
index 55c8658a84..8a95d17049 100644
--- a/effects/mousemark.cpp
+++ b/effects/mousemark.cpp
@@ -83,7 +83,8 @@ void MouseMarkEffect::paintScreen( int mask, QRegion region, ScreenPaintData& da
     }
 
 void MouseMarkEffect::mouseChanged( const QPoint& pos, const QPoint&,
-    Qt::MouseButtons, Qt::KeyboardModifiers modifiers )
+    Qt::MouseButtons, Qt::MouseButtons,
+    Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers )
     {
     if( modifiers == ( Qt::META | Qt::SHIFT )) // activated
         {
diff --git a/effects/mousemark.h b/effects/mousemark.h
index cb6b2a8c60..a7d36f8c73 100644
--- a/effects/mousemark.h
+++ b/effects/mousemark.h
@@ -35,7 +35,8 @@ class MouseMarkEffect
         MouseMarkEffect();
         virtual void paintScreen( int mask, QRegion region, ScreenPaintData& data );
         virtual void mouseChanged( const QPoint& pos, const QPoint& old,
-            Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers );
+            Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+            Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers );
     private slots:
         void clear();
     private:
diff --git a/effects/trackmouse.cpp b/effects/trackmouse.cpp
index 5905949734..6b860b9df3 100644
--- a/effects/trackmouse.cpp
+++ b/effects/trackmouse.cpp
@@ -98,7 +98,7 @@ void TrackMouseEffect::postPaintScreen()
     }
 
 void TrackMouseEffect::mouseChanged( const QPoint&, const QPoint&, Qt::MouseButtons,
-    Qt::KeyboardModifiers modifiers )
+    Qt::MouseButtons, Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers )
     {
     if( modifiers == ( Qt::CTRL | Qt::META ))
         {
diff --git a/effects/trackmouse.h b/effects/trackmouse.h
index d2f810186d..a2bf2ab3c3 100644
--- a/effects/trackmouse.h
+++ b/effects/trackmouse.h
@@ -37,7 +37,8 @@ class TrackMouseEffect
         virtual void paintScreen( int mask, QRegion region, ScreenPaintData& data );
         virtual void postPaintScreen();
         virtual void mouseChanged( const QPoint& pos, const QPoint& old,
-            Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers );
+            Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+            Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers );
     private:
         QRect starRect( int num ) const;
         void loadTexture();
diff --git a/effects/zoom.cpp b/effects/zoom.cpp
index e74aceadde..8a3ea5b9b9 100644
--- a/effects/zoom.cpp
+++ b/effects/zoom.cpp
@@ -99,7 +99,8 @@ void ZoomEffect::actualSize()
     effects->addRepaintFull();
     }
 
-void ZoomEffect::mouseChanged( const QPoint& pos, const QPoint& old, Qt::MouseButtons, Qt::KeyboardModifiers )
+void ZoomEffect::mouseChanged( const QPoint& pos, const QPoint& old, Qt::MouseButtons,
+    Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers )
     {
     if( pos != old && zoom != 1 )
         effects->addRepaintFull();
diff --git a/effects/zoom.h b/effects/zoom.h
index 6a7c77ed46..d805ce2ea2 100644
--- a/effects/zoom.h
+++ b/effects/zoom.h
@@ -36,7 +36,8 @@ class ZoomEffect
         virtual void paintScreen( int mask, QRegion region, ScreenPaintData& data );
         virtual void postPaintScreen();
         virtual void mouseChanged( const QPoint& pos, const QPoint& old,
-            Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers );
+            Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+            Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers );
     private slots:
         void zoomIn();
         void zoomOut();
diff --git a/lib/kwineffects.cpp b/lib/kwineffects.cpp
index 586ba29424..e93f8eef5a 100644
--- a/lib/kwineffects.cpp
+++ b/lib/kwineffects.cpp
@@ -163,7 +163,8 @@ bool Effect::borderActivated( ElectricBorder )
     return false;
     }
 
-void Effect::mouseChanged( const QPoint&, const QPoint&, Qt::MouseButtons, Qt::KeyboardModifiers )
+void Effect::mouseChanged( const QPoint&, const QPoint&, Qt::MouseButtons,
+    Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers )
     {
     }
 
diff --git a/lib/kwineffects.h b/lib/kwineffects.h
index 9a6702a514..471ff3978e 100644
--- a/lib/kwineffects.h
+++ b/lib/kwineffects.h
@@ -40,7 +40,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define KWIN_EFFECT_API_MAKE_VERSION( major, minor ) (( major ) << 8 | ( minor )) 
 #define KWIN_EFFECT_API_VERSION_MAJOR 0
-#define KWIN_EFFECT_API_VERSION_MINOR 3
+#define KWIN_EFFECT_API_VERSION_MINOR 4
 #define KWIN_EFFECT_API_VERSION KWIN_EFFECT_API_MAKE_VERSION( \
     KWIN_EFFECT_API_VERSION_MAJOR, KWIN_EFFECT_API_VERSION_MINOR )
 
@@ -244,8 +244,9 @@ class KWIN_EXPORT Effect
         virtual void desktopChanged( int old );
         virtual void windowDamaged( EffectWindow* w, const QRect& r );
         virtual void windowGeometryShapeChanged( EffectWindow* w, const QRect& old );
-        virtual void mouseChanged( const QPoint& pos, const QPoint& old,
-            Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers );
+        virtual void mouseChanged( const QPoint& pos, const QPoint& oldpos,
+            Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
+            Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers );
         virtual void grabbedKeyboardEvent( QKeyEvent* e );
         /**
          Receives events registered for using EffectsHandler::registerPropertyType().
diff --git a/workspace.cpp b/workspace.cpp
index d5589afef6..2499473264 100644
--- a/workspace.cpp
+++ b/workspace.cpp
@@ -2632,7 +2632,8 @@ void Workspace::checkCursorPos()
     cursorPos(); // update if needed
     if( last != last_cursor_pos || lastb != last_buttons )
         static_cast< EffectsHandlerImpl* >( effects )->mouseChanged( cursorPos(), last,
-            x11ToQtMouseButtons( last_buttons ), x11ToQtKeyboardModifiers( last_buttons ));
+            x11ToQtMouseButtons( last_buttons ), x11ToQtMouseButtons( lastb ),
+            x11ToQtKeyboardModifiers( last_buttons ), x11ToQtKeyboardModifiers( lastb ));
     }
 
 } // namespace