Rehearsal marks take up extra space when used on full-measure rests

[Panteck]

Lilypond 2.11.29, Windows XP.

When you put a rehearsal mark on a measure that is a full measure rest (or
where the previous measure is a full measure rest), the rest is pushed
off-center.  This is especially noticeable when the rehearsal mark is at the
start of a multi-measure rest.

\version "2.11.28"
\paper { ragged-right = ##t }
{ 
        \override MultiMeasureRest #'expand-limit = 1 
        \set Score.skipBars = ##t 
        
        R1 \mark \default R1 

        % This measure is centered as expected
        R1

        R1 \mark \default R1*4 R1 
}

--Steven

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