Space after barline for DynamicText in Dynamics context

[Daniel Rosen]

In the example below, modifying DynamicText.X-offset in the Voice context 
forces extra space to appear after the barline so that there's no collision, 
but doing the same thing in a Dynamics context does not. Is there a way to have 
the Dynamics context behave the way the Voice context does in this regard?

\version "2.19.83"

\new PianoStaff <<
   \new Staff { s1
                \override DynamicText.X-offset = -4.25
                f1\mf
                f1 }
   \new Dynamics { s1*2
                   \override DynamicText.X-offset = -4.25
                   s\mf }
   \new Staff { s1*3 }
>>

DR