Looks like slur collision detection and resolution (the slur is moved upwards)
works fine for sharp accidentals, but is ignored for flat accidentals.
Lily-Code (here tested on current lilybin.com, but seems to be reproducible in
all lily versions of the last couple of years, hence it's probably not a recent
regression):
% LilyBin
\score{
{
\override Stem.direction = #UP
\override Slur.direction = #UP
a'( g'') a'( g'')
a'( ges'') a'( gis'')
}
\layout{}
\midi{}
}
Best wishes,
Jürgen
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