From cecbb34f60713f8cae7bc4d9ca5de53ca6c501f0 Mon Sep 17 00:00:00 2001
From: Vladimir Krivosheev <vladimir.krivosheev@jetbrains.com>
Date: Wed, 5 Apr 2017 17:19:48 +0200
Subject: [PATCH] =?UTF-8?q?if=20child=20is=20already=20resolved/rejected?=
 =?UTF-8?q?=20=E2=80=94=20no=20need=20to=20notify=20it?=
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---
 .../src/org/jetbrains/concurrency/AsyncPromise.kt           | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/platform/projectModel-api/src/org/jetbrains/concurrency/AsyncPromise.kt b/platform/projectModel-api/src/org/jetbrains/concurrency/AsyncPromise.kt
index b6312da03294..9153b11c70f7 100644
--- a/platform/projectModel-api/src/org/jetbrains/concurrency/AsyncPromise.kt
+++ b/platform/projectModel-api/src/org/jetbrains/concurrency/AsyncPromise.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2016 JetBrains s.r.o.
+ * Copyright 2000-2017 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -78,6 +78,10 @@ open class AsyncPromise<T> : Promise<T>, Getter<T> {
   override fun notify(child: AsyncPromise<in T>) {
     LOG.assertTrue(child !== this)
 
+    if (child.state != State.PENDING) {
+      return
+    }
+
     when (state) {
       State.PENDING -> {
         addHandlers(Consumer({ child.catchError { child.setResult(it) } }), Consumer({ child.setError(it) }))