added wxTextCtrl::ChangeValue() which is the same as SetValue() but doesn't send the text changed event (first part of patch 1553551)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41739 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/textctrl.cpp

@@ -564,6 +564,15 @@ void wxTextCtrl::SetValue(const wxString& str)
     }
 }
 
+void wxTextCtrl::ChangeValue(const wxString& str)
+{
+    // optimize redraws
+    if ( GetValue() == str )
+        return ;
+
+    GetPeer()->SetStringValue( str ) ;
+}
+
 void wxTextCtrl::SetMaxLength(unsigned long len)
 {
     m_maxLength = len ;