ContentService.GetPagedChildren should also only get children

src/Umbraco.Core/Services/ContentService.cs

@@ -578,11 +578,9 @@ namespace Umbraco.Core.Services
                 var repository = RepositoryFactory.CreateContentRepository(uow);
 
                 var query = Query<IContent>.Builder;
-                //if the id is System Root, then just get all
-                if (id != Constants.System.Root)
-                {
-                    query.Where(x => x.ParentId == id);
-                }
+                // always check for a parent - else it will also get decendants (and then you should use the GetPagedDescendants method)
+                query.Where(x => x.ParentId == id);
+
                 IQuery<IContent> filterQuery = null;
                 if (filter.IsNullOrWhiteSpace() == false)
                 {

src/Umbraco.Core/Services/MediaService.cs

@@ -457,7 +457,7 @@ namespace Umbraco.Core.Services
                 var repository = RepositoryFactory.CreateMediaRepository(uow);
 
                 var query = Query<IMedia>.Builder;
-                // always check for a parent - else it will also get decendants
+                // always check for a parent - else it will also get decendants (and then you should use the GetPagedDescendants method)
                 query.Where(x => x.ParentId == id);
 
                 IQuery<IMedia> filterQuery = null;