Instrument names run off left margin

[Nathan]

 Without overriding anything, the output of the code below has the 
instrument names running off of the left margin. Is this a bug? a 
problem with my computer? because am I supposed to use a particular 
setting? the expected behavior?

\version "2.12.3"
\paper{ ragged-right=##t }
\new StaffGroup <<
\new Staff{
    \set Staff.instrumentName = #"Violin 1" \set 
Staff.shortInstrumentName = #"Vln. 1"
    R1*30
}
\new Staff{
    \set Staff.instrumentName = #"Violin 2" \set 
Staff.shortInstrumentName = #"Vln. 2"
    R1*30
}
>>