patch 8.2.0371: crash with combination of terminal popup and autocmd Commit: https://github.com/vim/vim/commit/cee52204ca030ce7814844e4dab8b4ed897ba3cc Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 11 14:19:58 2020 +0100 patch 8.2.0371: crash with combination of terminal popup and autocmd Problem: Crash with combination of terminal popup and autocmd. Solution: Disallow closing a popup that is the current window. Add a check that the current buffer is valid. (closes #5754)