Merge branch '51200-markdown-footnotes-don-t-render-when-inside-a-table' into 'master'

Resolve "Markdown footnotes don't render when inside a table..."

Closes #51200

See merge request gitlab-org/gitlab-ce!21675

Gemfile.lock

@@ -125,7 +125,7 @@ GEM
     coderay (1.1.2)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
-    commonmarker (0.17.8)
+    commonmarker (0.17.13)
       ruby-enum (~> 0.5)
     concord (0.1.5)
       adamantium (~> 0.2.0)

spec/lib/banzai/filter/markdown_filter_spec.rb

@@ -66,4 +66,21 @@ describe Banzai::Filter::MarkdownFilter do
       end
     end
   end
+
+  describe 'footnotes in tables' do
+    it 'processes footnotes in table cells' do
+      text = <<-MD.strip_heredoc
+      | Column1   |
+      | --------- |
+      | foot [^1] |
+
+      [^1]: a footnote
+      MD
+
+      result = filter(text)
+
+      expect(result).to include('<td>foot <sup')
+      expect(result).to include('<section class="footnotes">')
+    end
+  end
 end