For filters, if the input is SafeString, the output should also be SafeString

[wenfw]

e.g.

The code below returns a SafeString.

{{ some_html_string | filter_returns_safe_string }}

Then the code below should return a SafeString too, but it does not.

{{ some_html_string | filter_returns_safe_string | upper }}

[wenfw]

Just discovered that we can use this approach:

{{ some_html_string | filter_returns_safe_string | upper | safe }}

I'm going to close this issue. Thanks.