Comparison View: Fix wrong horizontal location when dragging starts

Use localPos instead of windowPos

ApplicationLibCode/UserInterface/RiuComparisonViewMover.cpp

@@ -61,7 +61,7 @@ bool RiuComparisonViewMover::eventFilter( QObject* watched, QEvent* event )
 
                 if ( m_dragState == LEFT_EDGE )
                 {
-                    QPointF    mousePos          = mEv->windowPos();
+                    QPointF    mousePos          = mEv->localPos();
                     QPointF    normMousePos      = { mousePos.x() / m_viewer->width(), mousePos.y() / m_viewer->height() };
                     cvf::Rectf orgCompViewWindow = m_viewer->comparisonViewVisibleNormalizedRect();