patch 9.0.1077: can add text property with negative ID before virtual text Commit: https://github.com/vim/vim/commit/4ce1f99a2d58b809ab5a5c602bd031426f8527e8 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Dec 19 13:31:06 2022 +0000 patch 9.0.1077: can add text property with negative ID before virtual text Problem: Can add text property with negative ID before virtual text property. Solution: Remember that a text property with a negative ID was used and give an appropriate error message. (closes #11725) Fix index computation.