In 4.5 the signal-to-slot connections between the QSlider
and the QSpinBox were bidirectional. That setup is still
desirable; it must have been broken accidentally during
preferences refactorings.
Signed-off-by: K. Heller <pestophagous@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>