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Add fallback section ID with ToC (#11941)
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@ -45,7 +45,7 @@ class TOCGenerator
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parsed_html.traverse do |node|
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next unless TARGET_ELEMENTS.include?(node.name)
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anchor = node['id'] || node.text.parameterize
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anchor = node['id'] || node.text.parameterize.presence || 'sec'
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@slugs[anchor] += 1
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anchor = "#{anchor}-#{@slugs[anchor]}" if @slugs[anchor] > 1
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