th:text does not escape 0x1f (UNIT SEPARATOR) character for xml/html

[lgawron]

0x1f character (UNIT SEPARATOR) is not allowed for xml/html documents yet the value is not escaped thus rendering the generated xml unparseable.

If you do not treat this as bug, as there is no clear escape replacement for 0x1f (as with " > <) is there any way to plug in some additional escaping logic into the engine?

[danielfernandez]

Thymeleaf makes use of Unbescape's Level1 HTML escaping, as explained here.

I've added this to Unbescape here: unbescape/unbescape#29