remove distinct workaround

#12989

src/vs/workbench/parts/debug/common/debugModel.ts

@@ -212,7 +212,7 @@ export abstract class ExpressionContainer implements debug.IExpressionContainer
 						const start = this.getChildrenInChunks ? this.startOfVariables : undefined;
 						const count = this.getChildrenInChunks ? this.indexedVariables : undefined;
 						return this.fetchVariables(start, count, 'indexed')
-							.then(variables => arrays.distinct(childrenArray.concat(variables), child => child.name));
+							.then(variables => childrenArray.concat(variables));
 					});
 			}
 		}