patch 8.2.1871: using %v in 'errorformat' may fail before %Z Commit: https://github.com/vim/vim/commit/c95940c06a125d3afe6516f11f8b2f5697a6b3b9 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Oct 20 14:59:12 2020 +0200 patch 8.2.1871: using %v in 'errorformat' may fail before %Z Problem: Using %v in 'errorformat' may fail before %Z. Solution: Set qf_viscol only when qf_col is set. (closes https://github.com/vim/vim/issues/7169)