[6.0] Introduce Joomla 6.0 compatibility plugin

administrator/components/com_admin/script.php

@@ -287,6 +287,8 @@ protected function uninstallExtensions()
              * ['type' => 'plugin', 'element' => 'demotasks', 'folder' => 'task', 'client_id' => 0, 'pre_function' => null],
              * ['type' => 'plugin', 'element' => 'compat', 'folder' => 'system', 'client_id' => 0, 'pre_function' => 'migrateCompatPlugin'],
              */
+            // Uninstall the old joomla 5 compatibility plugin
+            ['type' => 'plugin', 'element' => 'compat', 'folder' => 'behaviour', 'client_id' => 0, 'pre_function' => null],
         ];
 
         $db = Factory::getDbo();

administrator/language/en-GB/plg_behaviour_compat6.ini

@@ -4,4 +4,10 @@
 ; Note : All ini files need to be saved as UTF-8
 
 PLG_BEHAVIOUR_COMPAT6="Behaviour - Backward Compatibility 6"
-PLG_COMPAT6_XML_DESCRIPTION="This plugin should be enabled before updating to Joomla 6."
+PLG_COMPAT6_FIELD_CLASSES_ALIASES_DESCRIPTION="Add class aliases for classes which have been renamed or moved to a namespace."
+PLG_COMPAT6_FIELD_CLASSES_ALIASES_LABEL="Classes Aliases"
+PLG_COMPAT6_FIELD_LEGACY_CLASSES_DESCRIPTION="Activate this option if your extension requires previously deprecated classes removed from the current version of Joomla. These removed classes can be found in the folder /plugins/behavior/compat6/classes/."
+PLG_COMPAT6_FIELD_LEGACY_CLASSES_LABEL="Include Deprecated Classes"
+PLG_COMPAT6_FIELD_REMOVED_ASSETS_DESCRIPTION="Activate this option if your extension requires removed assets which has resulted in an exception. The assets provided are empty but prevent the exception."
+PLG_COMPAT6_FIELD_REMOVED_ASSETS_LABEL="Removed Assets"
+PLG_COMPAT6_XML_DESCRIPTION="If you use extensions which are not using the current Joomla Coding standards then this plugin, when enabled, will provide backward compatibility to the previous major version, Joomla 5."

administrator/language/en-GB/plg_behaviour_compat6.sys.ini

@@ -4,4 +4,4 @@
 ; Note : All ini files need to be saved as UTF-8
 
 PLG_BEHAVIOUR_COMPAT6="Behaviour - Backward Compatibility 6"
-PLG_COMPAT6_XML_DESCRIPTION="This plugin should be enabled before updating to Joomla 6."
+PLG_COMPAT6_XML_DESCRIPTION="If you use extensions which are not using the current Joomla Coding standards then this plugin, when enabled, will provide backward compatibility to the previous major version, Joomla 5."