Fix sanitizing lists contents (mastodon#11354)

* Add test

* Fix code for sanitizing nested lists stripping all tags

app/lib/sanitize_config.rb

@@ -25,6 +25,8 @@ module Config
  case env[:node_name]
  when 'li'
  env[:node].traverse do |node|
+ next unless %w(p ul ol li).include?(node.name)
+
  node.add_next_sibling('<br>') if node.next_sibling
  node.replace(node.children) unless node.text?
  end

spec/lib/sanitize_config_spec.rb

@@ -22,5 +22,9 @@
  it 'converts ul inside ul' do
  expect(Sanitize.fragment('<ul><li>Foo</li><li><ul><li>Bar</li><li>Baz</li></ul></li></ul>', subject)).to eq '<p>Foo<br>Bar<br>Baz</p>'
  end
+
+ it 'keep links in lists' do
+ expect(Sanitize.fragment('<p>Check out:</p><ul><li><a href="https://joinmastodon.org" rel="nofollow noopener" target="_blank">joinmastodon.org</a></li><li>Bar</li></ul>', subject)).to eq '<p>Check out:</p><p><a href="https://joinmastodon.org" rel="nofollow noopener" target="_blank">joinmastodon.org</a><br>Bar</p>'
+ end
  end
 end