Fixed window size not correctly updated when changed through Window::setSize (#474)

include/SFML/Window/Window.hpp

@@ -274,7 +274,7 @@ public :
     /// \see getSize
     ///
     ////////////////////////////////////////////////////////////
-    void setSize(const Vector2u size);
+    void setSize(const Vector2u& size);
 
     ////////////////////////////////////////////////////////////
     /// \brief Change the title of the window

src/SFML/Window/Window.cpp

@@ -231,10 +231,19 @@ Vector2u Window::getSize() const
 
 
 ////////////////////////////////////////////////////////////
-void Window::setSize(const Vector2u size)
+void Window::setSize(const Vector2u& size)
 {
     if (m_impl)
+    {
         m_impl->setSize(size);
+
+        // Cache the new size
+        m_size.x = size.x;
+        m_size.y = size.y;
+
+        // Notify the derived class
+        onResize();
+    }
 }