setArrowState () {
      if (Glide.settings.rewind) {
        return
      }

      const next = Controls._arrowControls.next
      const previous = Controls._arrowControls.previous

      this.resetArrowState(next, previous)

      if (Glide.index === 0) {
        this.disableArrow(previous)
      }

      if (Glide.index === Components.Run.length) {
        this.disableArrow(next)
      }
    }
Calculates, removes or adds `Glide.settings.classes.disabledArrow` class on the control arrows