Keep item data in sync with their position in wxEditableListBox.

When swapping the items, we also need to swap their client data and not just
their labels.

Closes #14800.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72916 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/editlbox.h

@@ -89,6 +89,10 @@ protected:
 
     DECLARE_CLASS(wxEditableListBox)
     DECLARE_EVENT_TABLE()
+
+private:
+    void SwapItems(long i1, long i2);
+
 };
 
 #endif  // wxUSE_EDITABLELISTBOX