slider compilation problem

[Pavel Sanda]

Hi Juergen,

the third line in this following block does not compile with qt4.

act_zoom_in_ = new QAction(qt_("Zoom &in"), this);
act_zoom_out_ = new QAction(qt_("Zoom &out"), this);
act_zoom_show_ = new QAction(qt_("Show zoom slider"));

Is adding "this" problem?

Pavel