QMenu with submenu potential memory leak

When clearing a QMenu, submenus are only removed, not deleted.

Example code:
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QMenu* menu = new QMenu(NULL);
QAction* action = menu->addAction("action");
QMenu* submenu = menu->addMenu("submenu");
QAction* subaction = submenu->addAction("subaction");

QPointer<QAction> watchdog1 = action;
QPointer<QMenu> watchdog2 = submenu;
QPointer<QAction> watchdog3 = subaction;

menu->clear(); // "submenu" is only removed not deleted, whereas "action" is deleted
if (watchdog1==NULL)

{ qDebug("action==NULL (1)"); }

if (watchdog2==NULL)

{ qDebug("submenu==NULL (1)"); }

if (watchdog3==NULL)

{ qDebug("subaction==NULL (1)"); }

delete menu; // "submenu" and "subaction" are deleted now, but this is bad behaviour if we only want to clear and rebuild a menu instead of deleting and reinstantiating it completely
if (watchdog1==NULL)

{ qDebug("action==NULL (2)"); }

if (watchdog2==NULL)

{ qDebug("submenu==NULL (2)"); }

if (watchdog3==NULL)

{ qDebug("subaction==NULL (2)"); }

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I don't know if this is the intended behaviour, but since I added the submenu with addMenu(QString) I expected the submenu to be deleted on clear() like the added "action".
In my case I have a long-living menu which I need to clear and re-fill according to the context, so this issue currently causes a memory leak for me.

Is it right, that the only chance to overcome this would be to manually delete the submenues on clear somehow or is there something I didn't see?