Elastic: Fix navlist border (when it is with scrollbar)

skins/elastic/styles/widgets/common.less

@@ -64,8 +64,6 @@ font.bold {
         flex: initial !important;
 
         .listing {
-            border-bottom: 1px solid @color-layout-border;
-
             tr:last-child td,
             li:last-child {
                 border-bottom: 0;
@@ -74,6 +72,9 @@ font.bold {
     }
 }
 
+.pagenav.expanded + .navlist {
+    border-bottom: 1px solid @color-layout-border;
+}
 
 .contact-header {
     display: flex;

skins/elastic/ui.js

@@ -3079,10 +3079,12 @@ function rcube_elastic_ui()
 
             navlist.animate({height: (Math.min(5, records.length) * height + 1) + 'px'}, speed);
             button.addClass('collapse').removeClass('expand');
+            $(obj).addClass('expanded');
         }
         else {
             navlist.animate({height: '0'}, speed);
             button.addClass('expand').removeClass('collapse');
+            $(obj).removeClass('expanded');
         }
     };