Index: admin/roles/usersroles.php
From: Jean-Roch Meurisse - University of Namur - Belgium
Date: 2017/06/15

MDL-59263 Wrong order of parameters in calls to pix_icon function (lines 196 and 197) prevent icons from rendering.

--- admin/roles/usersroles.php	(date 1496910511000)
+++ admin/roles/usersroles.php	(revision )
@@ -193,8 +193,8 @@
                 $strgoto = get_string('gotoassignroles', 'core_role', $a);
                 $strcheck = get_string('checkuserspermissionshere', 'core_role', $a);
             }
-            echo ' <a title="' . $strgoto . '" href="' . $raurl . '">' . $OUTPUT->pix_icon('t/edit', 'core', $stredit) . '</a> ';
-            echo ' <a title="' . $strcheck . '" href="' . $churl . '">' . $OUTPUT->pix_icon('t/preview', 'core', $strcheckpermissions) . '</a> ';
+            echo ' <a title="' . $strgoto . '" href="' . $raurl . '">' . $OUTPUT->pix_icon('t/edit', $stredit) . '</a> ';
+            echo ' <a title="' . $strcheck . '" href="' . $churl . '">' . $OUTPUT->pix_icon('t/preview', $strcheckpermissions) . '</a> ';
             echo "</p>\n";
         }
     }