Neos\Neos\Controller\Module\Management\WorkspacesController::renderContentChanges PHP Method

    protected function renderContentChanges(NodeInterface $changedNode)
    {
        $contentChanges = [];
        $originalNode = $this->getOriginalNode($changedNode);
        $changeNodePropertiesDefaults = $changedNode->getNodeType()->getDefaultValuesForProperties($changedNode);
        $renderer = new HtmlArrayRenderer();
        foreach ($changedNode->getProperties() as $propertyName => $changedPropertyValue) {
            if ($originalNode === null && empty($changedPropertyValue) || isset($changeNodePropertiesDefaults[$propertyName]) && $changedPropertyValue === $changeNodePropertiesDefaults[$propertyName]) {
                continue;
            }
            $originalPropertyValue = $originalNode === null ? null : $originalNode->getProperty($propertyName);
            if ($changedPropertyValue === $originalPropertyValue && !$changedNode->isRemoved()) {
                continue;
            }
            if (!is_object($originalPropertyValue) && !is_object($changedPropertyValue)) {
                $originalSlimmedDownContent = $this->renderSlimmedDownContent($originalPropertyValue);
                $changedSlimmedDownContent = $changedNode->isRemoved() ? '' : $this->renderSlimmedDownContent($changedPropertyValue);
                $diff = new Diff(explode("\n", $originalSlimmedDownContent), explode("\n", $changedSlimmedDownContent), ['context' => 1]);
                $diffArray = $diff->render($renderer);
                $this->postProcessDiffArray($diffArray);
                if (count($diffArray) > 0) {
                    $contentChanges[$propertyName] = ['type' => 'text', 'propertyLabel' => $this->getPropertyLabel($propertyName, $changedNode), 'diff' => $diffArray];
                }
            } elseif ($originalPropertyValue instanceof AssetInterface || $changedPropertyValue instanceof AssetInterface) {
                $contentChanges[$propertyName] = ['type' => 'asset', 'propertyLabel' => $this->getPropertyLabel($propertyName, $changedNode), 'original' => $originalPropertyValue, 'changed' => $changedPropertyValue];
            } elseif ($originalPropertyValue instanceof \DateTime && $changedPropertyValue instanceof \DateTime) {
                if ($changedPropertyValue->getTimestamp() !== $originalPropertyValue->getTimestamp()) {
                    $contentChanges[$propertyName] = ['type' => 'datetime', 'propertyLabel' => $this->getPropertyLabel($propertyName, $changedNode), 'original' => $originalPropertyValue, 'changed' => $changedPropertyValue];
                }
            }
        }
        return $contentChanges;
    }