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system_app_installed_filter
Allow plugins to filter the result of system_app_installed.
Code excerpt:
                        $filter_arr = [
                                'uid'=>$uid,
                                'app'=>$app,
                                'installed'=>$r
                        ];
                        call_hooks('system_app_installed_filter',$filter_arr);
                        $r = $filter_arr['installed'];cxref: Zotlabs/Lib/Apps.php