commit https://github.com/vim/vim/commit/93c88e0f6a4a8f7634ed84721daf4af46fc0d5db Author: Bram Moolenaar <Bram@vim.org> Date: Tue Sep 15 14:12:05 2015 +0200 patch 7.4.866 Problem: Crash when changing the 'tags' option from a remote command. (Benjamin Fritz) Solution: Instead of executing messages immediately, use a queue, like for netbeans. (James Kolb)

Tests for marks.

STARTTEST
:so small.vim
:" test that a deleted mark is restored after delete-undo-redo-undo
:/^\t/+1
:set nocp viminfo+=nviminfo
madduu
:let a = string(getpos("'a"))
:$put ='Mark after delete-undo-redo-undo: '.a
:/^\t/,$wq! test.out
ENDTEST

	textline A
	textline B
	textline C

Results: