Set ISA manually for Slic3r::Layer::Support.
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@ -58,6 +58,8 @@ sub make_perimeters {
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package Slic3r::Layer::Support;
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our @ISA = qw(Slic3r::Layer);
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sub islands {
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my $self = shift;
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return [ @{$self->slices}, @{$self->support_islands} ];
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