Placement::placeCentered operates on AbstractClient

placement.cpp

@@ -451,7 +451,7 @@ void Placement::placeCascaded(Client* c, QRect& area, Policy nextPlacement)
 /*!
   Place windows centered, on top of all others
 */
-void Placement::placeCentered(Client* c, const QRect& area, Policy /*next*/)
+void Placement::placeCentered(AbstractClient* c, const QRect& area, Policy /*next*/)
 {
 
     // get the maximum allowed windows space and desk's origin

placement.h

@@ -68,7 +68,7 @@ public:
     void placeCascaded(Client* c, QRect& area, Policy next = Unknown);
     void placeSmart(Client* c, const QRect& area, Policy next = Unknown);
     void placeMaximizing(Client* c, QRect& area, Policy next = Unknown);
-    void placeCentered(Client* c, const QRect& area, Policy next = Unknown);
+    void placeCentered(AbstractClient* c, const QRect& area, Policy next = Unknown);
     void placeZeroCornered(AbstractClient* c, const QRect& area, Policy next = Unknown);
     void placeDialog(Client* c, QRect& area, Policy next = Unknown);
     void placeUtility(Client* c, QRect& area, Policy next = Unknown);