|linebreaks, |linebreaksbr and |paragraphbreaks don't work as intended with regards to escaping

[Kijewski]

The examples in the book to e.g. |paragraphbreaks are wrong. The output of

{{ "hello\n\nworld"|paragraphbreaks }}

isn't

<p>hello</p><p>world</p>

but

<p>hello</p><p>world</p>

because the filter is not marked as HTML safe, i.e. it returns Result<impl fmt::Display, Infallible> instead of Result<HtmlSafeOutput<impl fmt::Display>, Infallible>. That makes it tempting to use {{ "hello\n\nworld"|paragraphbreaks|safe }}, but the output of |paragraphbreaks is not safe, because it does not escape its input.

Should we auto-escape the input of |paragraphbreaks and mark its output as safe? Right now you can do that manually with {{ "hello\n\nworld"|escape|paragraphbreaks|safe }}, which looks ridiculous.

[GuillaumeGomez]

Yes sounds like a good idea!