From 19fdb871389635ac30f33817d6d558f3976eb9de Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Sat, 29 Aug 2020 14:05:58 +0200
Subject: [PATCH] Preserve the leading and trailing whitespace in `<kbd>` on
 output

Fixes #3536
---
 .../output/node/HtmlOutputNodeKbd.class.php   | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeKbd.class.php

diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeKbd.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeKbd.class.php
new file mode 100644
index 0000000000..72152cbe5c
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeKbd.class.php
@@ -0,0 +1,42 @@
+<?php
+namespace wcf\system\html\output\node;
+use wcf\system\html\node\AbstractHtmlNodeProcessor;
+
+/**
+ * Replaces the leading and trailing space with `&nbsp;` to prevent the browser from implicitly trimming
+ * it on display.
+ * 
+ * @author      Alexander Ebert
+ * @copyright	2001-2020 WoltLab GmbH
+ * @license     GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package     WoltLabSuite\Core\System\Html\Output\Node
+ * @since       5.3
+ */
+class HtmlOutputNodeKbd extends AbstractHtmlOutputNode {
+	/**
+	 * @inheritDoc
+	 */
+	protected $tagName = 'kbd';
+	
+	/**
+	 * @inheritDoc
+	 */
+	public function process(array $elements, AbstractHtmlNodeProcessor $htmlNodeProcessor) {
+		/** @var \DOMElement $element */
+		foreach ($elements as $element) {
+			$textContent = $element->textContent;
+			
+			if (mb_strlen($textContent) !== 0) {
+				if ($textContent[0] === ' ') {
+					$textContent = "\u{00A0}" . mb_substr($textContent, 1);
+				}
+				
+				if (mb_substr($textContent, -1, 1) === ' ') {
+					$textContent = mb_substr($textContent, 0, -1) . "\u{00A0}";
+				}
+				
+				$element->textContent = $textContent;
+			}
+		}
+	}
+}
-- 
2.20.1