commit https://github.com/vim/vim/commit/451f849fd6282a4facd4f0f58af62837443fb5a6 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Apr 14 17:16:22 2016 +0200 patch 7.4.1735 Problem: It is not possible to only see part of the message history. It is not possible to clear messages. Solution: Add a count to ":messages" and a clear argument. (Yasuhiro Matsumoto)

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]