Strict-grace-spacing does not work

[Zoltan Selyem]

%%
%% Strict-grace-spacing does not work.
%%
%%
%% The example below is from the manual:
%% http://lilypond.org/doc/v2.11/Documentation/user/lilypond/Grace-notes
%%
%% I didn't use \paper{ ragged-right=##t } because
%% in this way the error is more apparent.
%%

\version "2.11.38"
<<
  \override Score.SpacingSpanner #'strict-grace-spacing = ##t
  \new Staff {
     c'4
     \afterGrace
     c'4
     { c'16[ c'8 c'16] }
     c'4
  }  
  \new Staff {
     c'16[ c'16 c'16 c'16]
     c'16[ c'16 c'16 c'16]
     c'4
  }
>>

strict-grace-spacing.png
Description: PNG image