Issue #3336616 by Harlor, wengerk: CKEditor5 replaces nbsp with white…

…spaces (#33)

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- fix issue #3336616 by Harlor, wengerk: CKEditor5 replaces nbsp with whitespaces
 
 ## [3.0.0] - 2022-12-05
 ### Removed

src/Plugin/Filter/NbspCleanerFilter.php

@@ -20,6 +20,11 @@
  */
 class NbspCleanerFilter extends FilterBase {
 
+  /**
+   * The nbsp character in UFT-8.
+   */
+  const UTF_8_NBSP = "\xc2\xa0";
+
   /**
    * {@inheritdoc}
    */
@@ -53,15 +58,15 @@ protected function swapNbspHtml($text) {
     $xpath = new \DOMXPath($document);
 
     foreach ($xpath->query('//span[@class="nbsp"]') as $node) {
-      if (!empty($node) && !empty($node->nodeValue)) {
-        // PHP DOM removing the tag (not content)
-        $node->parentNode->replaceChild(new \DOMText($node->nodeValue), $node);
+      if (!empty($node)) {
+        // PHP DOM replacing the nbsp-span with nbsp character.
+        $node->parentNode->replaceChild(new \DOMText(self::UTF_8_NBSP), $node);
       }
     }
     foreach ($xpath->query('//nbsp') as $node) {
-      if (!empty($node) && !empty($node->nodeValue)) {
-        // PHP DOM removing the tag (not content)
-        $node->parentNode->replaceChild(new \DOMText($node->nodeValue), $node);
+      if (!empty($node)) {
+        // PHP DOM replacing the nbsp-tag with nbsp character.
+        $node->parentNode->replaceChild(new \DOMText(self::UTF_8_NBSP), $node);
       }
     }
     return Html::serialize($document);