Some accidentals are not printed properly.

[Shotaro Funaji]

% Accidentals crash into notes.
% These spaces are the same as when without accidentals.
% They are too narrow.

\version "2.12.3"

{
        \set Staff.extraNatural = ##f
        <<
                { r8 r16 geses''
                r8 r16 ges''
                r8 r16 gisis''
                r8 r16 geses''?
                r8 r16 ges''?
                r8 r16 gisis''?
                }
        \\
                { \repeat unfold 6 { c'16 e' g' c'' } }
        >>
}