commit https://github.com/vim/vim/commit/f71d7b9ee5ceba75f70c30845332ddd728fd16c6 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 9 22:14:05 2016 +0200 patch 7.4.2189 Problem: Cannot detect encoding in a fifo. Solution: Extend the stdin way of detecting encoding to fifo. Add a test for detecting encoding on stdin and fifo. (Ken Takata)

Tests for marks.


	textline A
	textline B
	textline C


CTRL-A CTRL-X:
AAA 123 123
123 XXXXXXX
XXX 123 123


Results:
Mark after delete-undo-redo-undo: [0, 15, 2, 0]