[ErrorHandler] Fix rendered exception code highlighting on PHP 8.3

Author: tscni

Extension/CodeExtension.php

@@ -129,12 +129,10 @@ public function fileExcerpt(string $file, int $line, int $srcContext = 3): ?stri
             if (\PHP_VERSION_ID >= 80300) {
                 // remove main pre/code tags
                 $code = preg_replace('#^<pre.*?>\s*<code.*?>(.*)</code>\s*</pre>#s', '\\1', $code);
-                // split multiline code tags
-                $code = preg_replace_callback('#<code ([^>]++)>((?:[^<]*+\\n)++[^<]*+)</code>#', function ($m) {
-                    return "<code $m[1]>".str_replace("\n", "</code>\n<code $m[1]>", $m[2]).'</code>';
+                // split multiline span tags
+                $code = preg_replace_callback('#<span ([^>]++)>((?:[^<\\n]*+\\n)++[^<]*+)</span>#', function ($m) {
+                    return "<span $m[1]>".str_replace("\n", "</span>\n<span $m[1]>", $m[2]).'</span>';
                 }, $code);
-                // Convert spaces to html entities to preserve indentation when rendered
-                $code = str_replace(' ', '&nbsp;', $code);
                 $content = explode("\n", $code);
             } else {
                 // remove main code/span tags