This code was relying on the previous GtkGestureSingle::touch-only default
value.
https://bugzilla.gnome.org/show_bug.cgi?id=734285
gtk_widget_add_events (GTK_WIDGET (spin_button), GDK_SCROLL_MASK);
priv->swipe_gesture = gtk_gesture_swipe_new (GTK_WIDGET (spin_button));
+ gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->swipe_gesture), TRUE);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->swipe_gesture),
GTK_PHASE_CAPTURE);
g_signal_connect (priv->swipe_gesture, "begin",