FormDataFilter: change icon for expression

application/views/helpers/FormDataFilter.php

@@ -171,7 +171,7 @@ class Zend_View_Helper_FormDataFilter extends Zend_View_Helper_FormElement
              . $this->selectSign($filter)
              . $this->element($filter)
              . $this->removeLink($filter)
-             . $this->addLink($filter);
+             . $this->expandLink($filter);
     }
 
     protected function renderFilterExpression(FilterExpression $filter, $level)
@@ -441,6 +441,15 @@ class Zend_View_Helper_FormDataFilter extends Zend_View_Helper_FormElement
         );
     }
 
+    protected function expandLink(Filter $filter)
+    {
+        return $this->filterActionButton(
+            $filter,
+            'angle-double-right',
+            t('Wrap this expression into an operator')
+        );
+    }
+
     protected function stripLink(Filter $filter)
     {
         return $this->filterActionButton(

library/Director/Web/Form/IconHelper.php

@@ -22,11 +22,12 @@ use Icinga\Exception\ProgrammingError;
 class IconHelper
 {
     private $icons = array(
-        'minus'  => 'e806',
-        'trash'  => 'e846',
-        'plus'   => 'e805',
-        'cancel' => 'e804',
-        'help'   => 'e85b',
+        'minus'              => 'e806',
+        'trash'              => 'e846',
+        'plus'               => 'e805',
+        'cancel'             => 'e804',
+        'help'               => 'e85b',
+        'angle-double-right' => 'e87b',
     );
 
     private $mappedUtf8Icons;