user_can() cancel use set cache

public/js/nexus.js

@@ -22,18 +22,19 @@ jQuery(document).ready(function () {
         return {left, top}
     }
     var previewEle = jQuery('#nexus-preview')
-    var imgEle
-    jQuery(".preview").hover(function (e) {
+    var imgEle, selector = '.preview'
+    jQuery("body").on("mouseover", selector, function (e) {
         imgEle = jQuery(this);
         let position = getPosition(e, imgEle)
         let src = imgEle.attr("src")
         if (src) {
             previewEle.attr("src", src).css(position).fadeIn("fast");
         }
-    }, function (e) {
+    }).on("mouseout", selector, function (e) {
         previewEle.fadeOut("fast");
-    }).on("mousemove", function (e) {
+    }).on("mousemove", selector, function (e) {
         let position = getPosition(e, imgEle)
         previewEle.css(position)
     })
+
 })

public/settings.php

@@ -237,7 +237,6 @@ elseif ($action == 'savesettings_authority') 	// save user authority
 	saveSetting('authority', $AUTHORITY);
 	$actiontime = date("F j, Y, g:i a");
 	write_log("Tracker USER AUTHORITY settings updated by {$CURUSER['username']}. $actiontime",'mod');
-    build_class_permission_cache();
 	go_back();
 }
 elseif ($action == 'savesettings_tweak')	// save tweak