* Finish task #46162.

module/kanban/js/view.js

@@ -781,9 +781,9 @@ $(function()
         initKanban($(this));
     });
 
-    $('.icon-double-angle-up,.icon-double-angle-down').on('click', function()
+    $('.icon-chevron-double-up,.icon-chevron-double-down').on('click', function()
     {
-        $(this).toggleClass('icon-double-angle-up icon-double-angle-down');
+        $(this).toggleClass('icon-chevron-double-up icon-chevron-double-down');
         $(this).parents('.region').find('.kanban').toggle();
         hideKanbanAction();
     });
@@ -894,7 +894,13 @@ $(function()
         {
             if(sortType == 'region')
             {
-                $('.icon-double-angle-up').attr('class', 'icon-double-angle-down');
+                showRegion = '';
+                $('.icon-chevron-double-up').each(function()
+                {
+                    showRegion += $(this).attr('data-id') + ',';
+                    $(this).attr('class', 'icon-chevron-double-down');
+                });
+
                 $('.region').find('.kanban').hide();
                 hideKanbanAction();
             }
@@ -910,8 +916,14 @@ $(function()
 
             if(sortType == 'region')
             {
-                $('.icon-double-angle-down').attr('class', 'icon-double-angle-up');
-                $('.region').find('.kanban').show();
+                $('.region').each(function()
+                {
+                    if(showRegion.includes($(this).attr('data-id')))
+                    {
+                        $(this).find('.icon-chevron-double-down').attr('class', 'icon-chevron-double-up');
+                        $(this).find('.kanban').show();
+                    }
+                })
             }
             if(sortType == 'board')
             {

module/kanban/view/view.html.php

@@ -1,3 +1,15 @@
+<?php
+/**
+ * The view file of kanban module of ZenTaoPMS.
+ *
+ * @copyright   Copyright 2009-2021 青岛易软天创网络科技有限公司(QingDao Nature Easy Soft Network Technology Co,LTD, www.cnezsoft.com)
+ * @license     ZPL (http://zpl.pub/page/zplv12.html)
+ * @author      Guangming Sun<sungangming@easycorp.ltd>
+ * @package     kanban
+ * @version     $Id: view.html.php 935 2021-12-09 10:49:24Z $
+ * @link        https://www.zentao.net
+ */
+?>
 <?php include '../../common/view/header.html.php';?>
 <?php include '../../common/view/kanban.html.php';?>
 
@@ -33,7 +45,7 @@ $canCreateLane   = commonModel::hasPriv('kanban', 'createLane');
     <div class="region-header dropdown">
       <span class="strong"><?php echo $region->name;?></span>
       <label class="label label-region"><?php echo $this->lang->kanbanlane->common . ' ' . $region->laneCount;?></label>
-      <i class="icon icon-double-angle-up"></i>
+      <span><i class="icon icon-chevron-double-up" data-id="<?php echo $region->id;?>"></i></span>
       <?php if($canEditRegion || $canCreateLane || $canDeleteRegion):?>
       <button class="btn btn-link action" type="button" data-toggle="dropdown"><i class="icon icon-ellipsis-v"></i></button>
       <ul class="dropdown-menu pull-right">