Increase size of the permissions set input

fixes #7762

application/forms/Security/RoleForm.php

@@ -108,7 +108,8 @@ class RoleForm extends ConfigForm
                     'description'   => $this->translate(
                         'The permissions to grant. You may select more than one permission'
                     ),
-                    'multiOptions'  => $this->providedPermissions
+                    'multiOptions'  => $this->providedPermissions,
+                    'class'         => 'grant-permissions'
                 )
             )
         ));

public/css/icinga/forms.less

@@ -220,3 +220,8 @@ form label.has-feedback:after {
   /* Uncomment for 3D effect */
   /* text-shadow: 1px 1px 1px rgba(127, 127, 127, 0.3); */
 }
+
+select.grant-permissions {
+  height: 20em;
+  width: auto;
+}