[6.0] Fix language auto-loading without Application in CMSPlugin (joomla#45993)

* Fix language autoloading without application

* phpstan

* test

* test

* typo

Author: Fedik

libraries/src/Plugin/CMSPlugin.php

@@ -187,8 +187,7 @@ public function __construct($config = [])
         }
 
         // Load the language files if needed.
-        // It is required Application to be set, so we trying it here and in CMSPlugin::setApplication()
-        if ($this->autoloadLanguage && $this->getApplication()) {
+        if ($this->autoloadLanguage) {
             $this->autoloadLanguage();
         }
     }
@@ -253,6 +252,16 @@ final protected function autoloadLanguage(): void
 
         $app = $this->getApplication();
 
+        // Try to get Application from Factory
+        if (!$app) {
+            try {
+                $app = Factory::getApplication();
+            } catch (\Exception) {
+                // Cannot help here
+                return;
+            }
+        }
+
         // Check whether language already initialised in the Application, otherwise wait for it
         if (!$app->getLanguage()) {
             $app->getDispatcher()->addListener('onAfterInitialise', function () {
@@ -483,11 +492,6 @@ public function setApplication(CMSApplicationInterface $application): void
         if ($application->getLanguage()) {
             $this->setLanguage($application->getLanguage());
         }
-
-        // Try to load the language files if it were not loaded in the constructor already.
-        if ($this->autoloadLanguage) {
-            $this->autoloadLanguage();
-        }
     }
 
     /**

phpstan-baseline.neon

@@ -13676,6 +13676,16 @@ parameters:
 			count: 1
 			path: libraries/src/Plugin/CMSPlugin.php
 
+		-
+			message: '''
+				#^Call to method getDispatcher\(\) of deprecated interface Joomla\\CMS\\Application\\EventAwareInterface\:
+				4\.3 will be removed in 7\.0
+				             This interface will be removed without replacement as the Joomla 3\.x compatibility layer will be removed$#
+			'''
+			identifier: method.deprecatedInterface
+			count: 1
+			path: libraries/src/Plugin/CMSPlugin.php
+
 		-
 			message: '''
 				#^Call to deprecated method getCache\(\) of class Joomla\\CMS\\Factory\: