diff -r ef0373b55136 -r 758a864f9613 src/gui/graphicsview/qgraphicsgridlayout.cpp
--- a/src/gui/graphicsview/qgraphicsgridlayout.cpp	Fri Sep 17 08:34:18 2010 +0300
+++ b/src/gui/graphicsview/qgraphicsgridlayout.cpp	Mon Oct 04 01:19:32 2010 +0300
@@ -641,7 +641,8 @@
     Q_D(const QGraphicsGridLayout);
     qreal left, top, right, bottom;
     getContentsMargins(&left, &top, &right, &bottom);
-    return d->engine.sizeHint(d->styleInfo(), which , constraint) + QSizeF(left + right, top + bottom);
+    const QSizeF extraMargins(left + right, top + bottom);
+    return d->engine.sizeHint(d->styleInfo(), which , constraint - extraMargins) + extraMargins;
 }