QComboBox::setLineEdit not setting focuspolicy on OS X

On OS X QComboBox::init() sets focus policy to Qt::TabFocus. QComboBox::setLineEdit does not change the focus policy. Therefore, if you call setEditable after setLineEdit the focus policy is never changed from TabFocus, leaving you with a broken combo box that does not receive input focus on mouse clicks.

In Qt 4.8.x calling setEditable() after setLineEdit worked fine. In fact calling only setLineEdit() without setEditable() also worked.

The fix is to either have setLineEdit() change the focu policy itself or have it call setEditable().