dynamic displaced too much in some settings

[Arvid Grøtting]

Dynamic (e.g. \pp) markings aren't aligned properly
when stacking lots of markings and using, e.g. 
\pp\> as well.

Using MacOS X 10.3 and Lilypond 2.8.1:

\version "2.8.1"
\score {
  {
    % fails to align correctly:
    g'8\pp\>-.\( g'\!-.\) 
    % workaround:
    << g'8\pp-.\( { s16 s16\> } >> g'\!-.\) 
  }

  \layout {}
 }