horizontal offset bug of skip markups

[Werner LEMBERG]

[git dd442f49]

There is a horizontal offset bug if a markup is attached to a skip.
Look at this small example:

  \paper {
    ragged-right = ##f
  }

  foo = {
    s1
    \time 7/8 s8*7^"foobar"
    \time 10/8
  }

  bar = {
    R1
    R8*7
  }

  <<
    \context Staff = "foo" \foo
    \context Staff = "foo" \bar
  >>

The word `foobar' is attached to a skip, which should be always
positioned at the beginning of the bar, just as if I position, say, a
quarter note.  However, it isn't currently -- the final time signature
just makes the effect more visible.

Since I'm not sure whether this is related to Joe's recent changes (or
whether my assumption w.r.t. skip positioning is wrong) I'm posting it
here first before adding a bug report.


    Werner