src/Extension/SteppedCheckoutExtension.php
public function IsCurrentStep($name)
    {
        if ($this->owner->getAction() === $name) {
            return true;
        } elseif (!$this->owner->getAction() || $this->owner->getAction() === 'index') {
            return $this->actionPos($name) === 0;
        }
        return false;
    }
public function IsCurrentStep($name)
    {
        if ($this->owner->getAction() === $name) {
            return true;
        } elseif (!$this->owner->getAction() || $this->owner->getAction() === 'index') {
            return $this->actionPos($name) === 0;
        }
        return false;
    }
Check if passed action is the same as the current step