Index: wp-admin/menu-header.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/menu-header.php	(revision 41369b1cedb896bb172e4b72cc125266085d8bdd)
+++ wp-admin/menu-header.php	(revision )
@@ -149,9 +149,9 @@
 				$menu_file = substr( $menu_file, 0, $pos );
 			if ( ! empty( $menu_hook ) || ( ( 'index.php' != $submenu_items[0][2] ) && file_exists( WP_PLUGIN_DIR . "/$menu_file" ) && ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) ) ) {
 				$admin_is_parent = true;
-				echo "<a href='admin.php?page={$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
+				echo "<a href='".add_query_arg('page', $submenu_items[0][2], admin_url('admin.php'))."'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
 			} else {
-				echo "\n\t<a href='{$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
+				echo "\n\t<a href='".admin_url($submenu_items[0][2])."'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
 			}
 		} elseif ( ! empty( $item[2] ) && current_user_can( $item[1] ) ) {
 			$menu_hook = get_plugin_page_hook( $item[2], 'admin.php' );
@@ -160,9 +160,9 @@
 				$menu_file = substr( $menu_file, 0, $pos );
 			if ( ! empty( $menu_hook ) || ( ( 'index.php' != $item[2] ) && file_exists( WP_PLUGIN_DIR . "/$menu_file" ) && ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) ) ) {
 				$admin_is_parent = true;
-				echo "\n\t<a href='admin.php?page={$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
+				echo "\n\t<a href='".add_query_arg('page', $item[2], admin_url('admin.php'))."'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
 			} else {
-				echo "\n\t<a href='{$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
+				echo "\n\t<a href='".admin_url($item[2])."'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
 			}
 		}
 
@@ -221,12 +221,12 @@
 					if ( ( ! $admin_is_parent && file_exists( WP_PLUGIN_DIR . "/$menu_file" ) && ! is_dir( WP_PLUGIN_DIR . "/{$item[2]}" ) ) || file_exists( $menu_file ) )
 						$sub_item_url = add_query_arg( array( 'page' => $sub_item[2] ), $item[2] );
 					else
-						$sub_item_url = add_query_arg( array( 'page' => $sub_item[2] ), 'admin.php' );
+						$sub_item_url = add_query_arg( array( 'page' => $sub_item[2] ), admin_url('admin.php') );
 
 					$sub_item_url = esc_url( $sub_item_url );
-					echo "<li$class><a href='$sub_item_url'$class>$title</a></li>";
+					echo "<li$class><a href='".admin_url($sub_item_url)."'$class>$title</a></li>";
 				} else {
-					echo "<li$class><a href='{$sub_item[2]}'$class>$title</a></li>";
+					echo "<li$class><a href='".admin_url($sub_item[2])."'$class>$title</a></li>";
 				}
 			}
 			echo "</ul>";