Manually sets a keyval and modifier mask as the accelerator rendered by @accel_label.
If a keyval and modifier are explicitly set then these values are used regardless of any associated accel closure or widget.
Providing an @accelerator_key of 0 removes the manual setting.
a keyval, or 0
the modifier mask for the accel
3.6
See Implementation
Manually sets a keyval and modifier mask as the accelerator rendered by @accel_label.
If a keyval and modifier are explicitly set then these values are used regardless of any associated accel closure or widget.
Providing an @accelerator_key of 0 removes the manual setting.