Certain loose columns don't block before barlines

[address@hidden]

\version "2.17.9"

% compare

{
  \key ces \major
  << { a a a a } { s2.^\p^\< s8 s8^\ff } >> \break
  \key cis \major
  a1
}

% to

{
  \key ces \major
  a4 a a a a a a a a a a a
  << { a a a a } { s2.^\p^\< s8 s8^\ff } >> \break
  \key cis \major
  a1
}

% the dynamic should not slide over the key signature change in the second 
example

PastedGraphic-4.pdf
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PastedGraphic-3.pdf
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