GTK_UPDATE_ALWAYS When refreshing your GtkSpinButton, the value is always displayed. GTK_UPDATE_IF_VALID When refreshing your GtkSpinButton, the value is only displayed if it is valid within the bounds of the spin button's GtkAdjustment.
See Implementation
GTK_UPDATE_ALWAYS When refreshing your GtkSpinButton, the value is always displayed. GTK_UPDATE_IF_VALID When refreshing your GtkSpinButton, the value is only displayed if it is valid within the bounds of the spin button's GtkAdjustment.