Bad spacing algorithm

[Nick Payne]

Running 2.13.21. The accidental on the B-flat overlays the previous 
stem. I corrected it with the override. Is there a better way to fix the 
problem (it happens in several places):

\version "2.13.21"

{
    \stemUp
    fis''16 a g'' a gis'' a a'' a bes'' a b'' a c''' a cis''' a
    fis'' a g'' a gis'' a a'' a \once \override Staff.Accidental 
#'X-extent = #'(-3 . 0.8) bes'' a b'' a c''' a cis''' a
}

Nick

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