ties can collide with dots

[Andrew Hawryluk]

Given the right note spacing and tie directions, ties can collide with
rhythmic augmentation dots. In this example, if the line width is
reduced to 52 LilyPond avoids the collision. Increasing the line width
reduces the severity of the collision by reducing the initial slope of
the tie. (Bug found when writing out organ parts with two voices per
staff, I don't just sit at home trying these things randomly!)

Andrew

\version "2.11.41"
\paper {
        ragged-right = ##f
        line-width = 53
}

\relative c'' {
        \tieDown
        <e b>4.~
        <e b>8
}