The updateDelegate() function checks isEditable() which in
turn checks if d->lineEdit != 0, so we need to make the
call after the lineEdit has actually been set/unset, otherwise
the change to the delegate will not come until the next time
you update the delegate.
[ChangeLog][QComboBox] Fixed updating appearance of popup menu
when changing the editable state of the combo box.
Change-Id: Ib32f36cabd53c2c30d6256484a1eae131419960a
Task-number: QTBUG-33537
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
c4430ed023