Cleanup unnecessary files

.gitignore

@@ -70,6 +70,7 @@ Desktop.ini
 # Extra files installed by Composer not needed in the CMS environment
 # This should only ignore files like unit testing or READMEs, production
 # code must remain to ensure all libraries properly function
+/libraries/vendor/bin
 /libraries/vendor/brumann/polyfill-unserialize/.gitattributes
 /libraries/vendor/brumann/polyfill-unserialize/.gitignore
 /libraries/vendor/brumann/polyfill-unserialize/.travis.yml
@@ -97,6 +98,8 @@ Desktop.ini
 /libraries/vendor/joomla/*/.github
 /libraries/vendor/joomla/*/.gitignore
 /libraries/vendor/joomla/*/.gitmodules
+/libraries/vendor/joomla/*/.drone.jsonnet
+/libraries/vendor/joomla/*/.drone.yml
 /libraries/vendor/joomla/*/docs
 /libraries/vendor/joomla/*/Tests
 /libraries/vendor/joomla/*/vendor
@@ -118,12 +121,15 @@ Desktop.ini
 /libraries/vendor/joomla/session/Joomla/Session/ruleset.xml
 /libraries/vendor/leafo/lessphp/docs
 /libraries/vendor/leafo/lessphp/tests
+/libraries/vendor/leafo/lessphp/.drone.yml
 /libraries/vendor/leafo/lessphp/.gitignore
 /libraries/vendor/leafo/lessphp/.travis.yml
 /libraries/vendor/leafo/lessphp/composer.json
 /libraries/vendor/leafo/lessphp/Makefile
 /libraries/vendor/leafo/lessphp/package.sh
+/libraries/vendor/leafo/lessphp/phpunit.xml.dist
 /libraries/vendor/leafo/lessphp/README.md
+/libraries/vendor/leafo/lessphp/ruleset.xml
 /libraries/vendor/paragonie/random_compat/.gitignore
 /libraries/vendor/paragonie/random_compat/.scrutinizer.yml
 /libraries/vendor/paragonie/random_compat/.travis.yml

administrator/components/com_admin/script.php

@@ -2039,6 +2039,20 @@ public function deleteUnexistingFiles()
 
 			// Joomla! 3.9.23
 			'/.drone.jsonnet',
+
+			// Joomla! added by the 3.9.23-rc1
+			'/libraries/vendor/bin/lessify',
+			'/libraries/vendor/bin/lessify.bat',
+			'/libraries/vendor/bin/plessc',
+			'/libraries/vendor/bin/plessc.bat',
+			'/libraries/vendor/joomla/archive/.drone.jsonnet',
+			'/libraries/vendor/joomla/archive/.drone.yml',
+			'/libraries/vendor/joomla/string/.drone.jsonnet',
+			'/libraries/vendor/joomla/string/.drone.yml',
+			'/libraries/vendor/leafo/lessphp/.drone.yml',
+			'/libraries/vendor/leafo/lessphp/.phpunit.xml.dist',
+			'/libraries/vendor/leafo/lessphp/.ruleset.xml',
+
 		);
 
 		// TODO There is an issue while deleting folders using the ftp mode

libraries/vendor/composer/ClassLoader.php

@@ -60,7 +60,7 @@ class ClassLoader
     public function getPrefixes()
     {
         if (!empty($this->prefixesPsr0)) {
-            return call_user_func_array('array_merge', $this->prefixesPsr0);
+            return call_user_func_array('array_merge', array_values($this->prefixesPsr0));
         }
 
         return array();

libraries/vendor/composer/autoload_real.php

@@ -13,6 +13,9 @@ public static function loadClassLoader($class)
         }
     }
 
+    /**
+     * @return \Composer\Autoload\ClassLoader
+     */
     public static function getLoader()
     {
         if (null !== self::$loader) {