[Interest] How to make transparent ToolTip on Linux

[Igor Mironchik]

Hi,

I'm trying to make transparent ToolTip that will move text cursor when 
it moves.

I use the next code:

CursorShifter::CursorShifter( QWidget * parent )
    :    QWidget( parent, Qt::ToolTip | Qt::FramelessWindowHint |
            Qt::WindowDoesNotAcceptFocus |
            Qt::NoDropShadowWindowHint |
            Qt::WindowStaysOnTopHint )
    ,    d( new CursorShifterPrivate( this ) )
{
    d->init();
}

void
CursorShifterPrivate::init()
{
    color = q->palette().color( QPalette::Highlight );
    light = lighterColor( color, 75 );
    basicSize = qRound( (qreal) FingerGeometry::width() * 0.2 );
    timer = new QTimer( q );
    q->setWindowModality( Qt::NonModal );

    q->setAttribute( Qt::WA_TranslucentBackground, true );
    q->setAttribute( Qt::WA_NoSystemBackground, true );
    q->setAutoFillBackground( false );

    QObject::connect( timer, SIGNAL( timeout() ),
        q, SLOT( _q_hideTimer() ) );
}

But I receive black instead of transparent. Look at the picture...

ToolTip

Is it a bug of Qt, or it relevant to my Kubuntu 15.04?

And if anybody know, how to make transparent ToolTip?

Thank you.
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