System-start-delimiter

[Rune Zedeler]

Having implemented nested staff-groups I have found out that
translator-overridings only taker effect in the innermost staff-group.
I.e. when having two nested staff-groups and setting

 \translator {
   \StaffGroupContext
   SystemStartDelimiter \override #'arch-width = #'0.5;
 }

The changing only takes effect in the inner staff-group... 

Another thing:
In system-start-delimiter.cc I see the line

  Real h = height + 2 * arc_height;

But I really think that you mean

 Real h = height + 2 * arc_width;

(arc_height changes the x-axis-size of arc ; arc_width changes the
y-axis-size)
Will not fix it since I'm not sure.

-Rune