commit https://github.com/vim/vim/commit/50e5376926dc2ec4a26a7a16f8f0f3213c4afdf0 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Oct 27 14:49:15 2016 +0200 patch 8.0.0047 Problem: Crash when using the preview window from an unnamed buffer. (lifepillar) Solution: Do not clear the wrong buffer. (closes https://github.com/vim/vim/issues/1200)

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.