Categories optimize (#6999)

* WIP

* fix category page

* fix counts, and copyPrivileges

* fix lint

* more fixes,

* redis fix

* fix test

* fix  category test

* remove getParentsAndChildren

test/database/sorted.js

@@ -147,6 +147,24 @@ describe('Sorted Set methods', function () {
 				done();
 			});
 		});
+
+		it('should return duplicates if two sets have same elements', function (done) {
+			async.waterfall([
+				function (next) {
+					db.sortedSetAdd('dupezset1', [1, 2], ['value 1', 'value 2'], next);
+				},
+				function (next) {
+					db.sortedSetAdd('dupezset2', [2, 3], ['value 2', 'value 3'], next);
+				},
+				function (next) {
+					db.getSortedSetRange(['dupezset1', 'dupezset2'], 0, -1, next);
+				},
+				function (data, next) {
+					assert.deepStrictEqual(data, ['value 1', 'value 2', 'value 2', 'value 3']);
+					next();
+				},
+			], done);
+		});
 	});
 
 	describe('getSortedSetRevRange()', function () {