1\version "2.16.0"
2
3\header {
4  texidoc = "Text markup using @code{center-column} shall
5still reserve space for its whole width and not overwrite the previous stencil."
6}
7
8% Here the two center-columns should not collide with the +
9\markup \line {
10  \center-column { \line {XXX} \line {Y} }
11  "+"
12  \center-column { \line {XXX} \line {Y}}
13}
14