alignment: gjpqy chars in markup

[Graham Percival]

What's the best way to get two markup strings (once containing a gjpqy, 
the other
without such characters) to align?  In the example below, the "bag" is 
typeset
higher than "foo", because the "g" requires space under the line.
The extra space seems to correspond to 0.4 staffspaces, so I _could_ 
align them
by doing
\once \override TextScript #'extra-offset = #'(0 . 0.4)
but this seems like a non-ideal solution.


\layout{raggedright=##t}
{ c'^"foo" c'^"bag" }