From 15f7bdf88299514bf2c003eb0b1c043d4bf2ffa3 Mon Sep 17 00:00:00 2001
From: Alexander Zolotov <alexander.zolotov@jetbrains.com>
Date: Sun, 3 Jul 2016 01:54:09 +0300
Subject: [PATCH] Diagnostic for EA-54980

---
 .../intellij/codeInsight/template/impl/TemplateState.java  | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateState.java b/platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateState.java
index 708eb139e39c..58be21ddd588 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateState.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateState.java
@@ -856,7 +856,12 @@ public class TemplateState implements Disposable {
   }
 
   private void replaceString(String newValue, int start, int end, int segmentNumber) {
-    String oldText = myDocument.getCharsSequence().subSequence(start, end).toString();
+    TextRange range = TextRange.create(start, end);
+    if (!TextRange.from(0, myDocument.getCharsSequence().length()).contains(range)) {
+      LOG.error("Diagnostic for EA-54980. Can't extract " + range + " range. " + presentTemplate(myTemplate), 
+                AttachmentFactory.createAttachment(myDocument));
+    }
+    String oldText = range.subSequence(myDocument.getCharsSequence()).toString();
 
     if (!oldText.equals(newValue)) {
       mySegments.setNeighboursGreedy(segmentNumber, false);