Dynamics take up too much vertical space

[Rune Zedeler]

The outlines used to detect collisions are way too rough in the case of 
dynamics.

\version "2.11.0"
\layout { ragged-last = ##t }
{
  \dynamicUp
  d''2  e''8 \< c'' c''4\!
  d''2( e''8)\< c'' c''4\!
  d''2( e''8)\> c'' c''4\!
  d''2( e''8)\< c'' c''4\!\f
}

In this example we notice the following.
The first measure looks fine.
In the second measure the cresc is for too high. The only difference to 
first measure is the added slur, so it must be the slur, that pushes the 
dynamic too high up.
In the third measure the cresc has been replaced with a decresc. This 
does not affect vertical spacing. One would assum that the cresc was 
higher than the decresc because it takes up more vertical space at the 
left end where the problematic slur is.
In the fourth measure the cresc is even higher than the 2nd measure. The 
only difference is that I have added a forte-sign after the cresc. It 
seems like the forte sign is considered to be colliding with the slur 
even though the slur ends half a measure before the forte-sign.

-Rune