BURs: move cosplay tags when moving character tags.

When aliasing or renaming a character tag, move the corresponding
*_(cosplay) tag if it exists.

app/logical/tag_mover.rb

@@ -9,6 +9,7 @@ class TagMover
 
   def move!
     CurrentUser.scoped(user) do
+      move_cosplay_tag!
       move_tag_category!
       move_artist!
       move_wiki!
@@ -56,6 +57,15 @@ class TagMover
     end
   end
 
+  def move_cosplay_tag!
+    old_cosplay_tag = "#{old_tag.name}_(cosplay)"
+    new_cosplay_tag = "#{new_tag.name}_(cosplay)"
+
+    if Tag.nonempty.where(name: old_cosplay_tag).exists?
+      TagMover.new(old_cosplay_tag, new_cosplay_tag).move!
+    end
+  end
+
   def move_saved_searches!
     SavedSearch.rewrite_queries!(old_tag.name, new_tag.name)
   end

test/unit/bulk_update_request_test.rb

@@ -210,6 +210,21 @@ class BulkUpdateRequestTest < ActiveSupport::TestCase
           assert_equal(false, @bur.valid?)
           assert_equal(["Can't rename aaa -> bbb (the 'aaa' tag doesn't exist)"], @bur.errors.full_messages)
         end
+
+        context "when renaming a character tag with a *_(cosplay) tag" do
+          should "move the *_(cosplay) tag as well" do
+            @post = create(:post, tag_string: "toosaka_rin_(cosplay)")
+            @wiki = create(:wiki_page, title: "toosaka_rin_(cosplay)")
+            @ta = create(:tag_alias, antecedent_name: "toosaka_rin", consequent_name: "tohsaka_rin")
+
+            @bur = create(:bulk_update_request, script: "rename toosaka_rin -> tohsaka_rin")
+            @bur.approve!(@admin)
+            perform_enqueued_jobs
+
+            assert_equal("cosplay tohsaka_rin tohsaka_rin_(cosplay)", @post.reload.tag_string)
+            assert_equal("tohsaka_rin_(cosplay)", @wiki.reload.title)
+          end
+        end
       end
     end