Volta Instrument engraver bug

[Roy . Rankin]

In the following example the volta spanner goes clear to the left
margin of the page in 1.3.45 (actually first seen about 1.3.43).

If the Instrument_name_engraver is not included, the spanner starts in
the proper place.  The \break is not in the file which first showed the
problem.

Regards,
Roy Rankin


voice4 = \notes {
\clef bass;
 \property Staff.instrument = "Bass"
 \property Staff.instr = "B"
 \time 4/4;  f,2 (   ) f,8    r8   f8    e8    
\repeat  volta 2
{
 d8.    d16    e8.    f16    f8    c8    c16    c8.    
}
\alternative
{
    {   f,2 (   ) f,8    r8   f8    e8 \break   }
    {   f,2.    r8   c16    c16      |
    }
}
}
voicedefault = \notes {
 \property Staff.timeSignatureStyle="C"
 \time 4/4; \key f; 
 \tempo 4 = 200;
}
\score{
        \notes <


        \context Staff="4"
        {
            \$voicedefault
            \$voice4 
        }

    >
        \paper {
            font_normal = 12.;
            \translator {
                 \StaffContext 
                 \consists Instrument_name_engraver;
            }
        }
}