dash-period behaviour

[yota moteuchi]

Hi,

I don't understand, using lilypond 2.11.20 with this simplest script :
\version "2.11.20"

\new Score {
 \new Staff {
     \relative c'' {
     \setTextCresc
     c4 \< c c c
     c c c c \!
     }
 }
}

I get a result where the dashed line have a weirdly laaaaaarge span...
Looks like if lilyond had kept internally an odd constant for the 'dash-period variable...

How could I reset this ?

Thank you

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