Using the 'avoid-slur property (redux)

[Daniel Rosen]

In the following example, I can't figure out how to get the DynamicText to 
appear inside the Slur:

\version "2.17.95"
\relative c {
  f16( f a'8\p a8)
}

This is exactly the same question as the one posed in this thread from a few 
years ago 
(http://thread.gmane.org/gmane.comp.gnu.lilypond.general/42664/focus=42680), 
but the answer given concerning DynamicTexts confuses me a little---is there no 
way to make this happen?

DR