public ContextualLinkInterface::getGroup()
Returns the group this contextual link should be rendered in.
A contextual link group is a set of contextual links that are displayed together on a certain page. For example, the 'block' group displays all links related to the block, such as the block instance edit link as well as the views edit link, if it is a view block.
string The contextual links group name.
public function getGroup();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!ContextualLinkInterface.php/function/ContextualLinkInterface::getGroup/8.1.x