Tie too short after break when staves have different key signatures

[Neil Puttock]

Hi there,

In this snippet, the key signature in the first stave makes the tie in the
second very short:

\version "2.11.30"
\paper { ragged-right = ##t }
one = { \key as \major R1*2 }
two = \relative { b'1 ~ \break b }
\score {
    \new GrandStaff <<
    \context Staff = one \one
    \context Staff = two \two
    >>
}

It also demonstrates a quirk with semibreves on the centre line: the tie
direction changes across the break.

Regards,
Neil