QMenu does not take into account the width of separators with text

To reproduce:
Add one item and one separator to a QMenu
Make the text of the separator longer than the text of the normal item.
Result:
the width of the QMenu is not sufficient, the text of the separator is clipped.

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Add another qmenu item with the same (long) text as the separator.
Result:
now the width is calculated properly.

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Qt-4.6.3
qmenu.cpp
306 //calc what I think the size is..
307 if (action->isSeparator())

else {

(same thing in Qt-4.7.0-rc1)