break-visibility of KeySignature and KeyCancellation inconsistent

[Malte Meyn]

Hi list,

I wonder why there is two different ways to change the break-visibility 
of KeySignature and KeyCancellation grobs:

%%%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.21.0"

{
  \set Staff.explicitKeySignatureVisibility = #end-of-line-invisible
  \override Staff.KeyCancellation.break-visibility = #end-of-line-invisible
  \key g \major
  R1
  \break \key f \major
  R
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%

\overriding KeySignature.break-visibility has no effect and there is no 
context property explicitKeyCancellationVisibility, however there is 
printKeyCancellation which is a boolean, not a boolean vector. That’s 
inconsistent and I cannot imagine why this would be necessary. I 
searched the tracker and the mailing list archives but I couldn’t find 
any hints … Should we consider this a bug?

Cheers,
Malte