Fselect does not return file name when used with kdialog

[Stangoesagain]

There's a bug in UI:Dialog module where fselect does not return selected file name when using kdialog (I'm on KDE5). It prints file name to the terminal, though. See the details in http://www.perlmonks.org?node_id=1161064

So far I narrowed it down to fselect sub in KDialog.pm. In this part:

my $command = $self->prepare_command
( $args, $fmt,
path => $self->make_kvl($args,($args->{'path'}||abs_path())),
filter => $self->make_kvl($args,($args->{'filter'}||'*'))
);

my ($rv,$selected) = $self->command_string($command);
$self->_post($args);
return($rv == 0 ? $selected : 0);

the line

my ($rv,$selected) = $self->command_string($command);

returns $rv value as 0 but does not assign any value to $selected, and that's when selected file name gets written to terminal instead.

When zenity is preferred fselect works as expected.