Comment #3 on issue 1133 by [email protected]: Linebreaking calculation problem
http://code.google.com/p/lilypond/issues/detail?id=1133
Added note on recent discussion and workaround: --snip--
This is the only workaround that comes to my mind, but probably it's not what you are looking for:
\tempo \markup { \center-column { \line { a very long } \line { tempo string } } }
Indeed, this is a viable solution sometimes, e.g. in parts. Ideally, \tempo should accept an optional argument to provide an alternative markup for extremely tight situations.
--snip--
