Allow "class" attribute on the "a" tag in sanitization (#3623)

This preserves `<a ... class="u-url mention">` from other Mastodon instances.

diff --git a/app/lib/sanitize_config.rb b/app/lib/sanitize_config.rb
index 22b46a3d30c2e23e56bbe0f6bc47f17d3db8af51..9cf9b3db0c90b530630962817f1a2f1e5b9078aa 100644 (file)
--- a/app/lib/sanitize_config.rb
+++ b/app/lib/sanitize_config.rb
@@ -8,7 +8,7 @@ class Sanitize
       elements: %w(p br span a),
 
       attributes: {
-        'a'    => %w(href rel),
+        'a'    => %w(href rel class),
         'span' => %w(class),
       },