U4-9522 Media recycle bin does not show folders

src/Umbraco.Web.UI.Client/src/views/propertyeditors/listview/layouts/grid/grid.html

@@ -51,7 +51,7 @@
       </umb-file-dropzone>
 
       <umb-folder-grid
-         ng-if="folders.length > 0 && !vm.isRecycleBin"
+         ng-if="folders.length > 0"
          folders="folders"
          on-click="vm.selectFolder"
          on-click-name="vm.goToItem">

src/Umbraco.Web.UI.Client/src/views/propertyeditors/listview/layouts/grid/grid.listviewlayout.controller.js

@@ -37,7 +37,8 @@
       function activate() {
           vm.itemsWithoutFolders = filterOutFolders($scope.items);
 
-          if($scope.entityType === 'media') {
+          //no need to make another REST/DB call if this data is not used when we are browsing the bin
+          if ($scope.entityType === 'media' && !vm.isRecycleBin) {
             mediaTypeHelper.getAllowedImagetypes(vm.nodeId).then(function (types) {
                 vm.acceptedMediatypes = types;
             });

src/Umbraco.Web/Editors/EntityController.cs

@@ -222,6 +222,17 @@ namespace Umbraco.Web.Editors
             return GetResultForChildren(id, type);
         }
 
+        /// <summary>
+        /// Get paged descendant entities by id
+        /// </summary>
+        /// <param name="id"></param>
+        /// <param name="type"></param>
+        /// <param name="pageNumber"></param>
+        /// <param name="pageSize"></param>
+        /// <param name="orderBy"></param>
+        /// <param name="orderDirection"></param>
+        /// <param name="filter"></param>
+        /// <returns></returns>
         public IEnumerable<EntityBasic> GetAncestors(int id, UmbracoEntityTypes type)
         {
             return GetResultForAncestors(id, type);