Set canonicalURL in AbstractListViewPage

Closes #6477

Author: BurntimeX

wcfsetup/install/files/lib/page/AbstractListViewPage.class.php

@@ -51,6 +51,8 @@ public function readParameters()
         if (isset($_REQUEST['filters']) && \is_array($_REQUEST['filters'])) {
             $this->filters = $_REQUEST['filters'];
         }
+
+        $this->canonicalURL = $this->getCanonicalUrl();
     }
 
     #[\Override]
@@ -139,21 +141,19 @@ protected function getHeadContent(): string
             );
         }
 
-        $linkTags[] = \sprintf(
-            '<link rel="canonical" href="%s">',
-            StringUtil::encodeHTML(
-                LinkHandler::getInstance()->getControllerLink(static::class, \array_merge(
-                    $this->getBaseUrlParameters(),
-                    [
-                        'pageNo' => $this->listView->getPageNo() !== 1 ? $this->listView->getPageNo() : null,
-                    ]
-                ))
-            )
-        );
-
         return \implode("\n", $linkTags);
     }
 
+    protected function getCanonicalUrl(): string
+    {
+        return LinkHandler::getInstance()->getControllerLink(static::class, \array_merge(
+            $this->getBaseUrlParameters(),
+            [
+                'pageNo' => $this->pageNo !== 1 ? $this->pageNo : null,
+            ]
+        ));
+    }
+
     /**
      * Returns the list view instance for the rendering of this page.
      *