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my ($self, $fb, $exp) = @_;
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return undef if $self->is_path_ignored($fb->{path});
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# $fh gets auto-closed() by SVN::TxDelta::apply(),
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# (but $base does not,) so dup() it for reading in close_file
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open my $dup, '<&', $fh or croak $!;
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my ($base_is_link, $size);