filterstring / not an issue

[seppzzz]

Not an issue but an idea:

 foreach ($linkables as $class) {
            $identifier = str_replace('\\', '-', strtolower($class));
            $options[$identifier] = $class::LinkLabel();
            $linkTipe->setSource($options);
			
$linkableFilterString =  method_exists($class, 'linkableFilterString')? $class::linkableFilterString() : '';

            $dropdown = new DropdownField($identifier, _t('HtmlEditorField.NEWS', $class::LinkLabel()), $class::get()->where($linkableFilterString)->map('ID', 'Title'));
            $dropdown->addExtraClass('linkable');

            $compositeField->insertBefore($dropdown, 'Description');
        }

public static function linkableFilterString(){
		return "StartDate >= CURDATE()";
	}