Prepend “RE: <url>” fallback link to Mastodon-authored quote posts (#35971)

app/helpers/formatting_helper.rb

@@ -27,7 +27,9 @@ module FormattingHelper
   module_function :extract_status_plain_text
 
   def status_content_format(status)
-    html_aware_format(status.text, status.local?, preloaded_accounts: [status.account] + (status.respond_to?(:active_mentions) ? status.active_mentions.map(&:account) : []))
+    quoted_status = status.quote&.quoted_status if status.local?
+
+    html_aware_format(status.text, status.local?, preloaded_accounts: [status.account] + (status.respond_to?(:active_mentions) ? status.active_mentions.map(&:account) : []), quoted_status: quoted_status)
   end
 
   def rss_status_content_format(status)

app/lib/text_formatter.rb

@@ -44,6 +44,7 @@ class TextFormatter
     end
 
     html = simple_format(html, {}, sanitize: false).delete("\n") if multiline?
+    html = add_quote_fallback(html) if options[:quoted_status].present?
 
     html.html_safe # rubocop:disable Rails/OutputSafety
   end
@@ -172,4 +173,15 @@ class TextFormatter
   def preloaded_accounts?
     preloaded_accounts.present?
   end
+
+  def add_quote_fallback(html)
+    return html if options[:quoted_status].nil?
+
+    url = ActivityPub::TagManager.instance.url_for(options[:quoted_status]) || ActivityPub::TagManager.instance.uri_for(options[:quoted_status])
+    return html if url.blank? || html.include?(url)
+
+    <<~HTML.squish
+      <p class="quote-inline">RE: #{TextFormatter.shortened_link(url)}</p>#{html}
+    HTML
+  end
 end

app/models/status_edit.rb

@@ -45,6 +45,13 @@ class StatusEdit < ApplicationRecord
   delegate :local?, :application, :edited?, :edited_at,
            :discarded?, :reply?, :visibility, :language, to: :status
 
+  def quote
+    underlying_quote = status.quote
+    return if underlying_quote.nil? || underlying_quote.id != quote_id
+
+    underlying_quote
+  end
+
   def with_media?
     ordered_media_attachments.any?
   end