End-of-line-Slur shortend by clef in other staff

[Wendl, Arnold]

> very ugly

Hello,

The end of line occurrence of a broken slur is shortened,
if another staff contains a clef change at that line break.

Example shows this in version 2.18.2, version 2.19.81, and also 2.15.41 (and 
newer).
It did work correctly in version 2.15.39 (and more early versions).

\score {
  <<
    \new Staff {
      \repeat unfold 6 c''8 c''8( d''
      e''1)
    }
    \new Staff {
      e'1
      \break
      \clef bass
      c1
    }
  >>
  \layout {
    % reduce line length for a more obvious display
    indent = 0
    line-width = 50
  }
}

Arnold (from the German user forum)