Fix #4683: Automove _(style) tags when artists are processed via BUR.

app/logical/tag_mover.rb

@@ -13,6 +13,7 @@ class TagMover
       move_aliases!
       move_implications!
       move_cosplay_tag!
+      move_style_tag!
       move_artist!
       move_wiki!
       move_saved_searches!
@@ -84,6 +85,15 @@ class TagMover
     end
   end
 
+  def move_style_tag!
+    old_style_tag = "#{old_tag.name}_(style)"
+    new_style_tag = "#{new_tag.name}_(style)"
+
+    if old_tag.artist? && Tag.nonempty.exists?(name: old_style_tag)
+      TagMover.new(old_style_tag, new_style_tag).move!
+    end
+  end
+
   def move_saved_searches!
     SavedSearch.rewrite_queries!(old_tag.name, new_tag.name)
   end