Slider needs a valueModified signal for non-live updates

When using a live Slider, the moved signal can be used to be notified of changes to the value resulting from user interaction.

When using a non-live Slider, moved cannot be used, as the value itself doesn't change until the handle is released.

RowLayout {
    Slider {
        id: strengthSlider
        from: 1
        to: 100
        stepSize: 1
        snapMode: Slider.SnapAlways
        live: false
        onMoved: print("moved", value, valueAt(position))
    }
    Label {
        text: strengthSlider.valueAt(strengthSlider.position)
        Layout.minimumWidth: 60
    }
}

SpinBox has a valueModified signal, so that would be the most consistent choice for a name.

For live sliders, valueModified would be emitted when the handle is moved.

For non-live sliders, valueModified would be emitted when the handle is released after moving (assuming the value actually changed).