Change how changes to media attachments are stored for edits (#17696)

* Change how changes to media attachments are stored for edits

Fix not being able to re-order media attachments

* Fix not broadcasting updates when polls/media is changed through ActivityPub

* Various fixes and improvements

* Update app/models/report.rb

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

* Add tracking of media attachment description changes

* Change poll in status edit to have a structure closer to the real one

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/models/report.rb

@@ -63,8 +63,20 @@ class Report < ApplicationRecord
     Status.with_discarded.where(id: status_ids)
   end
 
-  def media_attachments
-    MediaAttachment.where(status_id: status_ids)
+  def media_attachments_count
+    statuses_to_query = []
+    count = 0
+
+    statuses.pluck(:id, :ordered_media_attachment_ids).each do |id, ordered_ids|
+      if ordered_ids.nil?
+        statuses_to_query << id
+      else
+        count += ordered_ids.size
+      end
+    end
+
+    count += MediaAttachment.where(status_id: statuses_to_query).count unless statuses_to_query.empty?
+    count
   end
 
   def rules