Make the Qt ComboBox behave in a Better Way

So, the ComboBox is a beast, and when used on a Delegate
it's very hard to get things right, wich is a pitty, because
I overly like qt. So:

1 - Combobox needs to show the popup when user press ↓ and ↑ keys
2 - Combobox needs to select when user press enter, not twice.
3 - Combobox neesds to select when user selects from the mouse, not
pressing enter after.
4 - Combobox needs to not mess with stuff when moving around.

Everything that I listed there works on a non-delegate combobox,
but for some reason, a delegate missed those, so I reimplemented
all. not nice, but now we have a code that will work, I hope.
*fingers crossed*

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>

qt-ui/modeldelegates.h

@@ -24,6 +24,8 @@ public:
     virtual bool eventFilter(QObject* object, QEvent* event);
 public slots:
 	void testActivation(const QString& s);
+	//HACK: try to get rid of this in the future.
+	void fakeActivation();
 	virtual void revertModelData(QWidget* widget, QAbstractItemDelegate::EndEditHint hint) = 0;
 protected:
 	QAbstractItemModel *model;