From abb302d3209f586be118fb67684acb69efb94c5a Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Thu, 6 Dec 2012 18:44:28 +0100
Subject: [PATCH] prevent SIOOBE

---
 .../codeInsight/lookup/impl/CompletionPreview.java         | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/CompletionPreview.java b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/CompletionPreview.java
index 6d0cc30c1a49..889e10756dec 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/CompletionPreview.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/CompletionPreview.java
@@ -130,7 +130,12 @@ public class CompletionPreview {
       }
     }
 
-    new CompletionPreview(lookup, text, lookup.itemPattern(item));
+    String prefix = lookup.itemPattern(item);
+    if (prefix.length() > text.length()) {
+      return;
+    }
+    
+    new CompletionPreview(lookup, text, prefix);
   }
 
   public void uninstallPreview() {