Fix bug where removing the last subfolder did not hide toggle button on its parent record (#6007)

CHANGELOG

@@ -17,6 +17,7 @@ CHANGELOG Roundcube Webmail
 - Fix Edge encoding bug when pasting text into the HTML editor, update to TinyMCE 4.5.8 (#5885)
 - Fix handling of unknown Content-Disposition type (#6002)
 - Fix truncated folder name on messages list in multi-folder mode, for folders with non-ascii characters (#6004)
+- Fix bug where removing the last subfolder did not hide toggle button on its parent record (#6007)
 
 RELEASE 1.3.1
 -------------

program/js/treelist.js

@@ -464,10 +464,11 @@ function rcube_treelist_widget(node, p)
    */
   function remove(id)
   {
-    var node, li;
+    var node, li, parent;
 
     if (node = indexbyid[id]) {
       li = id2dom(id, true);
+      parent = li.parent();
       li.remove();
 
       node.deleted = true;
@@ -477,6 +478,12 @@ function rcube_treelist_widget(node, p)
         id2dom(id, false).remove();
       }
 
+      // remove tree-toggle button and children list
+      if (!parent.children().length) {
+        parent.parent().find('div.treetoggle').remove();
+        parent.remove();
+      }
+
       return true;
     }