Rehearsal Marks & Bar Lengthening

[Will Oram]

Last question for awhile, I swear. :)

Under most circumstances \mark can lengthen the measure on which it 
occurs to incredible lengths. However long the \mark \markup string is, 
that much empty staff space sits underneath it down the system. Once 
\mark ends, *then* the content of the measure is printed.

How to tweak it so \mark \markup and the music underneath get along?

Best,

Will Oram // Genius @ Large // AIM spamguy21
spamguy (at) foxchange (dot) com // wro1 (at) cwru (dot) edu