Column line spacing changed with 2.18

Need troubleshooting help with a two-line markup block.

The block is used for the copyright statement in scores published by Mutopia and has to remain dimensionally stable over a wide range of possible staff-sizes.

To accomplish this, \abs-fontsize characters and \override #'(baseline-skip . 0 ) was used in an attempt to minimize any horizontal and vertical scaling with the various staff-size submitted for publication.

With v2.18.2, I noticed (baseline-skip . 0 ) no longer renders with zero space between lines of text, as it did with 2.14.2 and 2.16.1. A separator bar made up of two stacked vertical text bars now renders with a hairline in-between. Is there a way to remove this added padding?

The limitation I face is, the gap can’t be removed by using staff-sized text-positioning commands (i.e. \raise), or by replacing the stacked bars with a box (also staff-size-sensitive).

See attached images and minimal code that will render differently 2.16 vs 2.18. To see the full copyright markup block and example rendered scores, look at 2.16.1 vs. 2.18.2:

%%%%%%%%%%%%%%%%%%%%%%%%%%

\version "2.18.2" %renders with undesired hairline spacing between lines

%\version "2.16.1" %renders as desired in this version

#(set-global-staff-size 30) % markup block should be dimensionally stable for staff-size 15-30

\markup {

\override #'(baseline-skip . 0 )

\center-column { \abs-fontsize #12 \bold {

\char ##x01C0

\char ##x01C0 } %need ZERO space between these stacked bars

}

\override #'(baseline-skip . 0 )

\column {

\abs-fontsize #9 "line 1"

\concat {

\abs-fontsize #9 "line 2"

\abs-fontsize #12 \with-color #white \char ##x01C0 } %vertical spacer

}

From:	Javier Ruiz-Alma
Subject:	Column line spacing changed with 2.18
Date:	Mon, 28 Jul 2014 22:09:12 -0700