wbr tag is not listed in TracHTMLSanitizer.SAFE_TAGS and the sanitizer doesn't render well-formed fragment

[Jun Omae]

The wbr tag is defined in HTML5, but TracHTMLSanitizer removes the tags.

• ​<wbr>: The Line Break Opportunity element - HTML: HyperText Markup Language | MDN

Also, TracHTMLSanitizer incorrectly removes closed tag of the parent element. As the result, it doesn't render well-formed fragment.

Trac 1.6

>>> import trac, jinja2
>>> trac.__version__, jinja2.__version__
('1.6', '3.1.5')
>>> from trac.test import EnvironmentStub, MockRequest
>>> from trac.web.chrome import web_context
>>> from trac.wiki.formatter import format_to_html
>>> env = EnvironmentStub()
>>> req = MockRequest(env)
>>> context = web_context(req)
>>> format_to_html(env, context, u'{{{#!html\n<div> foo <wbr /> bar </div>\n}}}\n')
Markup('<div> foo ')
>>> format_to_html(env, context, u'{{{#!html\n<div> foo <wbr> bar </div>\n}}}\n')
Markup('<div> foo ')

Trac 1.0.20

>>> import trac, genshi
>>> trac.__version__, genshi.__version__
('1.0.20', '0.7.7')
>>> format_to_html(env, context, u'{{{#!html\n<div> foo <wbr /> bar </div>\n}}}\n')
<Markup u'<div> foo  bar </div>\n'>
>>> format_to_html(env, context, u'{{{#!html\n<div> foo <wbr> bar </div>\n}}}\n')
<Markup u'<div> foo </div>\n'>