--- src/widgets/qpopupmenu.cpp.sav
+++ src/widgets/qpopupmenu.cpp
@@ -457,6 +457,15 @@
     menuContentsChanged();
 }
 
+QRect QPopupMenu::screenRect( const QPoint& pos )
+{
+    int screen_num = QApplication::desktop()->screenNumber( pos );
+#ifdef Q_WS_MAC
+    return QApplication::desktop()->availableGeometry( screen_num );
+#else
+    return QApplication::desktop()->screenGeometry( screen_num );
+#endif
+}
 /*!
     Displays the popup menu so that the item number \a indexAtPoint
     will be at the specified \e global position \a pos. To translate a
@@ -501,6 +510,15 @@
     // point.
 #endif
 
+    QRect screen = screenRect( geometry().center());
+    QRect screen2 = screenRect( QApplication::reverseLayout()
+        ? pos+QPoint(width(),0) : pos );
+    // if the widget is not in the screen given by the position, move it
+    // there, so that updateSize() uses the right size of the screen
+    if( screen != screen2 ) {
+        screen = screen2;
+        move( screen.x(), screen.y());
+    }
     if(d->scroll.scrollable) {
 	d->scroll.scrollable = QPopupMenuPrivate::Scroll::ScrollNone;
 	d->scroll.topScrollableIndex = d->scroll.scrollableSize = 0;
@@ -520,18 +538,6 @@
 	updateSize(TRUE);
     }
 
-    int screen_num;
-    if (QApplication::desktop()->isVirtualDesktop())
-	screen_num =
-	    QApplication::desktop()->screenNumber( QApplication::reverseLayout() ?
-						   pos+QPoint(width(),0) : pos );
-    else
-	screen_num = QApplication::desktop()->screenNumber( this );
-#ifdef Q_WS_MAC
-    QRect screen = QApplication::desktop()->availableGeometry( screen_num );
-#else
-    QRect screen = QApplication::desktop()->screenGeometry( screen_num );
-#endif
     int sw = screen.width();			// screen width
     int sh = screen.height();			// screen height
     int sx = screen.x();			// screen pos
@@ -1059,7 +1065,7 @@
 				   mi->iconSet()->pixmap( QIconSet::Small, QIconSet::Normal ).width() + 4 );
 	}
 
-	int dh = QApplication::desktop()->height();
+	int dh = screenRect( geometry().center()).height();
 	ncols = 1;
 
 	for ( QMenuItemListIt it2( *mitems ); it2.current(); ++it2 ) {
@@ -2313,9 +2319,9 @@
 	bool right = FALSE;
 	if ( ( parentMenu && parentMenu->isPopupMenu &&
 	       ((QPopupMenu*)parentMenu)->geometry().x() < geometry().x() ) ||
-	     p.x() < 0 )
+	     p.x() < screenRect( p ).left())
 	    right = TRUE;
-	if ( right && (ps.width() > QApplication::desktop()->width() - mapToGlobal( r.topRight() ).x() ) )
+	if ( right && (ps.width() > screenRect( p ).right() - mapToGlobal( r.topRight() ).x() ) )
 	    right = FALSE;
 	if ( right )
 	    p.setX( mapToGlobal( r.topRight() ).x() );
@@ -2326,7 +2332,7 @@
 	bool left = FALSE;
 	if ( ( parentMenu && parentMenu->isPopupMenu &&
 	       ((QPopupMenu*)parentMenu)->geometry().x() > geometry().x() ) ||
-	     p.x() + ps.width() > QApplication::desktop()->width() )
+	     p.x() + ps.width() > screenRect( p ).right() )
 	    left = TRUE;
 	if ( left && (ps.width() > mapToGlobal( r.topLeft() ).x() ) )
 	    left = FALSE;
@@ -2334,8 +2340,8 @@
 	    p.setX( mapToGlobal( r.topLeft() ).x() - ps.width() );
     }
     QRect pr = popup->itemGeometry(popup->count() - 1);
-    if (p.y() + ps.height() > QApplication::desktop()->height() &&
-	p.y() - ps.height() + (QCOORD) pr.height() >= 0)
+    if (p.y() + ps.height() > screenRect( p ).bottom() &&
+	p.y() - ps.height() + (QCOORD) pr.height() >= screenRect( p ).top())
 	p.setY( p.y() - ps.height() + (QCOORD) pr.height());
 
     if ( style().styleHint(QStyle::SH_PopupMenu_SloppySubMenus, this )) {
--- src/widgets/qpopupmenu.h.sav
+++ src/widgets/qpopupmenu.h
@@ -152,6 +152,7 @@
 
     QSize	updateSize(bool force_recalc=FALSE, bool do_resize=TRUE);
     void	updateRow( int row );
+    QRect       screenRect(const QPoint& pos);
 #ifndef QT_NO_ACCEL
     void	updateAccel( QWidget * );
     void	enableAccel( bool );