Bug fix for back2top button in sidebar

Author: stevenjoezhang

layout/_macro/sidebar.swig

@@ -187,7 +187,7 @@
       {% endif %}
 
       {% if theme.back2top.enable and theme.back2top.sidebar %}
-        <div class="back-to-top">
+        <div class="back-to-top motion-element">
           <i class="fa fa-arrow-up"></i>
           {% if theme.back2top.scrollpercent %}
             <span id="scrollpercent"><span>0</span>%</span>

layout/_partials/head/head.swig

@@ -95,8 +95,7 @@
     scheme: '{{ theme.scheme }}',
     version: '{{ version }}',
     sidebar: {{ theme.sidebar | json_encode }},
-    back2top: {{ theme.back2top.enable }},
-    back2top_sidebar: {{ theme.back2top.sidebar }},
+    back2top: {{ theme.back2top | json_encode }},
     fancybox: {{ theme.fancybox }},
     fastclick: {{ theme.fastclick }},
     lazyload: {{ theme.lazyload }},

source/js/next-boot.js

@@ -11,7 +11,7 @@ $(document).ready(function() {
 
   NexT.utils.registerESCKeyEvent();
 
-  CONFIG.back2top && NexT.utils.registerBackToTop();
+  CONFIG.back2top.enable && NexT.utils.registerBackToTop();
 
   // Mobile top menu bar.
   $('.site-nav-toggle button').on('click', function() {

source/js/utils.js

@@ -275,7 +275,7 @@ NexT.utils = {
   },
 
   getSidebarb2tHeight: function() {
-    var sidebarb2tHeight = (CONFIG.back2top && CONFIG.back2top_sidebar) ? $('.back-to-top').height() : 0;
+    var sidebarb2tHeight = (CONFIG.back2top.enable && CONFIG.back2top.sidebar) ? $('.back-to-top').height() : 0;
     return sidebarb2tHeight;
   },