consider the full bb with deco in rendering

src/Window.hpp

@@ -105,4 +105,7 @@ public:
         return m_uSurface.xdg == rhs.m_uSurface.xdg && m_uSurface.xwayland == rhs.m_uSurface.xwayland && m_vPosition == rhs.m_vPosition && m_vSize == rhs.m_vSize && m_bFadingOut == rhs.m_bFadingOut;
     }
 
+    // methods
+    wlr_box         getFullWindowBoundingBox();
+
 };