commit https://github.com/vim/vim/commit/d4caf5c16a9f1c9477d426e58d8d3dc47ab5f066 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Mar 24 19:14:35 2016 +0100 patch 7.4.1643 Problem: Terminating file name has side effects. Solution: Restore the character. (mostly by James McCoy, closes https://github.com/vim/vim/issues/713)

Tests for file with some lines ending in CTRL-M, some not

STARTTEST
:set ta tx
:e!
:$-3,$w! test.out
:qa!
ENDTEST

this lines ends in a
this one doesn't
this one does
and the last one doesn't