patch 8.2.3063: crash when switching 'cryptmethod' to xchaha20 with undo file Commit: https://github.com/vim/vim/commit/65aee0b714e809b9f19862f3decd35055ed4de10 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jun 27 14:08:24 2021 +0200 patch 8.2.3063: crash when switching 'cryptmethod' to xchaha20 with undo file Problem: Crash when switching 'cryptmethod' to xchaha20 with an existing undo file. (Martin Tournoij) Solution: Disable reading undo file when decoding can't be done inplace. (issue #8467)