Fix #3583: Copying notes should copy tags to destination.

app/models/post.rb

@@ -8,6 +8,9 @@ class Post < ApplicationRecord
   class SearchError < Exception ; end
   class DeletionError < Exception ; end
 
+  # Tags to copy when copying notes.
+  NOTE_COPY_TAGS = %w[translated partially_translated check_translation translation_request reverse_translation]
+
   before_validation :initialize_uploader, :on => :create
   before_validation :merge_old_changes
   before_validation :normalize_tags
@@ -1414,7 +1417,7 @@ class Post < ApplicationRecord
       last_noted_at.present?
     end
 
-    def copy_notes_to(other_post)
+    def copy_notes_to(other_post, copy_tags: NOTE_COPY_TAGS)
       transaction do
         if id == other_post.id
           errors.add :base, "Source and destination posts are the same"
@@ -1439,6 +1442,14 @@ class Post < ApplicationRecord
         dummy.post_id = other_post.id
         dummy.x = dummy.y = dummy.width = dummy.height = 0
         dummy.save
+
+        copy_tags.each do |tag|
+          other_post.remove_tag(tag)
+          other_post.add_tag(tag) if has_tag?(tag)
+        end
+
+        other_post.has_embedded_notes = has_embedded_notes
+        other_post.save
       end
     end
   end