From 3c4ecd98691ca1744e5f45680922c8e42c71e73f Mon Sep 17 00:00:00 2001
From: "Vladimir.Orlov" <Vladimir.Orlov@jetbrains.com>
Date: Fri, 3 Oct 2014 12:06:42 +0400
Subject: [PATCH] IDEA-130718 Updater leaves behind a broken installation if it
 fails to open a file on Windows

---
 updater/src/com/intellij/updater/DeleteAction.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/updater/src/com/intellij/updater/DeleteAction.java b/updater/src/com/intellij/updater/DeleteAction.java
index 3dd1b850e415..8bc43ac41bb1 100644
--- a/updater/src/com/intellij/updater/DeleteAction.java
+++ b/updater/src/com/intellij/updater/DeleteAction.java
@@ -51,7 +51,9 @@ public class DeleteAction extends PatchAction {
   }
 
   protected void doRevert(File toFile, File backupFile) throws IOException {
-    Utils.delete(toFile); // make sure there is no directory remained on this path (may remain from previous 'create' actions
-    Utils.copy(backupFile, toFile);
+    if (!toFile.exists() || isModified(toFile)) {
+      Utils.delete(toFile); // make sure there is no directory remained on this path (may remain from previous 'create' actions
+      Utils.copy(backupFile, toFile);
+    }
   }
 }