[openstreetmap/openstreetmap-website] Provide a truncated view of recent diaries (PR #5121)

[David Tsiklauri]

@nertc commented on this pull request.



> +    def truncate_html(html_doc, max_length = nil, empty_tag_length = 1000)
+      return html_doc if max_length.nil?
+
+      doc = Nokogiri::HTML::DocumentFragment.parse(html_doc)
+      accumulated_length = 0
+      last_child = nil
+
+      doc.traverse do |node|
+        if accumulated_length >= max_length
+          node.remove unless !last_child.nil? && last_child.ancestors.include?(node)
+          next
+        end
+
+        next unless node.children.empty?
+
+        accumulated_length += node.text? ? node.text.length : empty_tag_length

Changed additional length to be added only when the tag name is `<img>`.

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