The "Enable simplified search bar (Vector skin only)" user preference should be removed from MediaWiki core.
While it seems like this user preference would be inside [[mw:Extension:Vector]], it's not. It's inside includes/Preferences.php:
if ( $wgVectorUseSimpleSearch ) {
$defaultPreferences['vector-simplesearch'] = array(
'type' => 'toggle', 'label-message' => 'vector-simplesearch-preference', 'section' => 'searchoptions/displaysearchoptions',
);
}
This should be an easy bug to resolve; marking it with the Bugzilla keyword
accordingly.
Version: 1.22.0
Severity: enhancement