From 783faded4bb852ef791bdb3409cd1bbea268b6ed Mon Sep 17 00:00:00 2001
From: Anton Lobov <Anton.Lobov@jetbrains.com>
Date: Wed, 20 Feb 2019 11:15:55 +0100
Subject: [PATCH] json schema: don't modify the original collection

---
 json/src/com/jetbrains/jsonSchema/impl/JsonSchemaObject.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaObject.java b/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaObject.java
index 98b302a3389e..ca2b3fd21e1b 100644
--- a/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaObject.java
+++ b/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaObject.java
@@ -280,7 +280,7 @@ public class JsonSchemaObject {
     if (other.myNot != null) myNot = other.myNot;
     if (other.myIfThenElse != null) {
       if (myIfThenElse == null) myIfThenElse = other.myIfThenElse;
-      else myIfThenElse.addAll(other.myIfThenElse);
+      else myIfThenElse = ContainerUtil.concat(myIfThenElse, other.myIfThenElse);
     }
     myShouldValidateAgainstJSType |= other.myShouldValidateAgainstJSType;
   }