slurs and ties confuse note separation

[Keith OHara]

% Note spacing should allow for accidentals and articulations
% Usually it does, but slurs and ties can cause errors

\version "2.12.3" % same in 2.13.46
{ g''8( c''\espressivo geses'' b''') }

To make the image showing the debug-output, I added to what is above,

\layout { \context { \Score
  \override PaperColumn #'stencil = #ly:separation-item::print
}} #(ly:set-option 'debug-skylines

needless.collision.png
Description: PNG image