Fix paquettg#85

Author: paquettg

src/PHPHtmlParser/Dom/HtmlNode.php

@@ -186,6 +186,7 @@ protected function clear(): void
         $this->innerHtml = null;
         $this->outerHtml = null;
         $this->text      = null;
+        $this->textWithChildren = null;
 
         if (is_null($this->parent) === false) {
             $this->parent->clear();

src/PHPHtmlParser/Dom/InnerNode.php

@@ -203,6 +203,9 @@ public function insertAfter(AbstractNode $child, int $id): bool
 			return $this->addChild($child, $this->children[$id]['next']);
 		}
 
+		// clear cache
+		$this->clear();
+
 		return $this->addChild($child);
 	}
 
@@ -344,6 +347,9 @@ public function replaceChild(int $childId, AbstractNode $newChild): void
 
         // remove old child
         unset($this->children[$childId]);
+
+        // clean out cache
+        $this->clear();
     }
 
     /**
@@ -415,6 +421,9 @@ public function setParent(InnerNode $parent): AbstractNode
             throw new CircularException('Can not add descendant "'.$parent->id().'" as my parent.');
         }
 
+		// clear cache
+		$this->clear();
+
         return parent::setParent($parent);
     }
 }