From 6694d2ae3a62b59e75b3416a41bf10775859753e Mon Sep 17 00:00:00 2001
From: Sergey Simonchik <sergey.simonchik@jetbrains.com>
Date: Fri, 27 May 2016 21:54:10 +0300
Subject: [PATCH] optimize removing invalid files

---
 .../src/com/intellij/lang/PerFileMappingsBase.java        | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/platform/projectModel-api/src/com/intellij/lang/PerFileMappingsBase.java b/platform/projectModel-api/src/com/intellij/lang/PerFileMappingsBase.java
index f7b45ddacb06..bb6b9d9bb1ae 100644
--- a/platform/projectModel-api/src/com/intellij/lang/PerFileMappingsBase.java
+++ b/platform/projectModel-api/src/com/intellij/lang/PerFileMappingsBase.java
@@ -60,10 +60,10 @@ public abstract class PerFileMappingsBase<T> implements PersistentStateComponent
   }
 
   private void cleanup() {
-    for (final VirtualFile file : new ArrayList<VirtualFile>(myMappings.keySet())) {
-      if (file != null //PROJECT, top-level
-          && !file.isValid()) {
-        myMappings.remove(file);
+    for (Iterator<VirtualFile> i = myMappings.keySet().iterator(); i.hasNext();) {
+      VirtualFile file = i.next();
+      if (file != null /* PROJECT, top-level */ && !file.isValid()) {
+        i.remove();
       }
     }
   }