Resolves the example case in #4199, but not the larger problem. We don't
need to escape quotes as we don't put the string in an attribute value.
From the docs at
https://docs.python.org/3/library/html.html#html.escape:
> If the optional flag quote is true, the characters (") and (') are also
> translated; this helps for inclusion in an HTML attribute value
> delimited by quotes, as in <a href="...">.
Escaping quotes means we end up with a literal ' in the completion
view wherever there is a quote in the source text.
However, problem in #4199, where unexpected parts of the text are
highlighted, can also happen with '<', '>', and '&', which still must be
escaped.
4f99af5876