Fixed error when replacing a number.

Added FIXME to remember me implement or review the need
of delete_text implementation.

src/gcal-date-entry.c

@@ -330,11 +330,14 @@ gcal_date_entry_delete_text (GtkEditable *editable,
 
   if (priv->internal_skip)
     {
+      /* FIXME: Handle delete_text */
+      /* handle delete */
+    }
+
   parent_editable_iface->delete_text (editable,
                                       start_pos,
                                       end_pos);
 }
-}
 
 static void
 gcal_date_entry_validate_and_insert (GcalDateEntry *entry)