make-dynamic-script doesn't change font

[Graham Percival]

In the example below, the "e" of "espr" obeys the font change 
(#:simple),
but the "spr" is still rendered in dynamic font.  The "e" is also much
larger than the "spr".


% OSX, 2.5.32
\version "2.5.32"
fespr = #(make-dynamic-script (markup #:dynamic "f" #:simple "espr" ) )
{
c4\fespr
}