message: Try to solve I21853 mouse wheel problem with GTK3
diff: @@ -1831,7 +1831,7 @@ static gboolean icvOnMouse( GtkWidget *widget, GdkEvent *event, gpointer user_da
  #if defined(GTK_VERSION3_4)
  // NOTE: in current implementation doesn't possible to put into callback function delta_x and delta_y separately
  double delta = (event->scroll.delta_x + event->scroll.delta_y);
  - cv_event = (event->scroll.delta_y!=0) ? CV_EVENT_MOUSEHWHEEL : CV_EVENT_MOUSEWHEEL;
  + cv_event = (event->scroll.delta_x==0) ? CV_EVENT_MOUSEWHEEL : CV_EVENT_MOUSEHWHEEL;
  #else
  cv_event = CV_EVENT_MOUSEWHEEL;
  #endif //GTK_VERSION3_4
  