LibGUI: Make autoformatting performed on InsertTextCommand visible to on_edit_action

Author: https://github.com/ccapitalK
Commit: 8dc0d9b7b7
Pull-request: https://github.com/SerenityOS/serenity/pull/4388
Issue: https://github.com/SerenityOS/serenity/issues/4369

Libraries/LibGUI/TextEditor.h

@@ -260,6 +260,7 @@ private:
     inline void execute(Args&&... args)
     {
         auto command = make<T>(*m_document, forward<Args>(args)...);
+        command->perform_formatting(*this);
         on_edit_action(*command);
         command->execute_from(*this);
         m_document->add_to_undo_stack(move(command));