DEV: Update display name in new quote format - Part 2 (#22104)

This change adds support retroactively updating display names in the new quote format when the user's name is changed. It happens through a background job that is triggered by a callback when a user is saved with a new name.

lib/quote_rewriter.rb

@@ -1,14 +1,11 @@
 # frozen_string_literal: true
 
 class QuoteRewriter
-  def initialize(user_id, old_username, new_username, avatar_img)
+  def initialize(user_id)
     @user_id = user_id
-    @old_username = old_username
-    @new_username = new_username
-    @avatar_img = avatar_img
   end
 
-  def rewrite_raw(raw)
+  def rewrite_raw_username(raw, old_username, new_username)
     pattern =
       Regexp.union(
         /(?<pre>\[quote\s*=\s*["'']?.*username:)#{old_username}(?<post>\,?[^\]]*\])/i,
@@ -18,7 +15,7 @@ class QuoteRewriter
     raw.gsub(pattern, "\\k<pre>#{new_username}\\k<post>")
   end
 
-  def rewrite_cooked(cooked)
+  def rewrite_cooked_username(cooked, old_username, new_username, avatar_img)
     pattern = /(?<=\s)#{PrettyText::Helpers.format_username(old_username)}(?=:)/i
 
     cooked
@@ -44,9 +41,33 @@ class QuoteRewriter
       end
   end
 
+  def rewrite_raw_display_name(raw, old_display_name, new_display_name)
+    pattern = /(?<pre>\[quote\s*=\s*["'']?)#{old_display_name}(?<post>\,[^\]]*username[^\]]*\])/i
+
+    raw.gsub(pattern, "\\k<pre>#{new_display_name}\\k<post>")
+  end
+
+  def rewrite_cooked_display_name(cooked, old_display_name, new_display_name)
+    pattern = /(?<=\s)#{PrettyText::Helpers.format_username(old_display_name)}(?=:)/i
+
+    cooked
+      .css("aside.quote")
+      .each do |aside|
+        next unless div = aside.at_css("div.title")
+
+        div.children.each do |child|
+          if child.text?
+            content = child.content
+            display_name_replaced = content.gsub!(pattern, new_display_name).present?
+            child.content = content if display_name_replaced
+          end
+        end
+      end
+  end
+
   private
 
-  attr_reader :user_id, :old_username, :new_username, :avatar_img
+  attr_reader :user_id
 
   def quotes_correct_user?(aside)
     Post.exists?(topic_id: aside["data-topic"], post_number: aside["data-post"], user_id: user_id)