Made MSW wxSpinCtrl emit UPDATE event when validating

the value in the text field upon kill focus.
 Documented this behaviour.
 This is in line with the GTK+ control.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41316 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/spinbutt.cpp

@@ -256,6 +256,11 @@ void wxSpinButton::SetValue(int val)
     }
 }
 
+void wxSpinButton::NormalizeValue()
+{ 
+    SetValue( GetValue() );
+}
+
 void wxSpinButton::SetRange(int minVal, int maxVal)
 {
     const bool hadRange = m_min < m_max;