commit https://github.com/vim/vim/commit/4a8c2cfc56b9affc36934aa0f20d8cfd2b1511c8 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Dec 19 15:28:18 2015 +0100 patch 7.4.979 Problem: When changing the crypt key the blocks read from disk are not decrypted. Solution: Also call ml_decrypt_data() when mf_old_key is set. (Ken Takata)

For information about installation of Farsi fonts and Vim usage in Farsi mode,
refer to the Farsi help file by typing ":help farsi" in Vim.