From 3129f0d22f78858b52289ab60d71600e366c1fbd Mon Sep 17 00:00:00 2001
From: Aleksey Pivovarov <AMPivovarov@gmail.com>
Date: Fri, 4 Sep 2015 14:07:35 +0300
Subject: [PATCH] EA-72290 - AIOOBE: LineSet.clearModificationFlags

---
 .../src/com/intellij/openapi/editor/impl/LineSet.java      | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/platform/core-impl/src/com/intellij/openapi/editor/impl/LineSet.java b/platform/core-impl/src/com/intellij/openapi/editor/impl/LineSet.java
index 1d3e1dfa4482..973ec2af3aaa 100644
--- a/platform/core-impl/src/com/intellij/openapi/editor/impl/LineSet.java
+++ b/platform/core-impl/src/com/intellij/openapi/editor/impl/LineSet.java
@@ -184,10 +184,15 @@ public class LineSet{
   }
 
   LineSet clearModificationFlags(int startLine, int endLine) {
-    if (startLine == endLine) return this;
+    if (startLine > endLine) {
+      throw new IllegalArgumentException("endLine < startLine: " + endLine + " < " + startLine + "; lineCount: " + getLineCount());
+    }
     checkLineIndex(startLine);
     checkLineIndex(endLine - 1);
 
+    if (isLastEmptyLine(endLine - 1)) endLine--;
+    if (startLine >= endLine) return this;
+
     byte[] flags = myFlags.clone();
     for (int i = startLine; i < endLine; i++) {
       flags[i] &= ~MODIFIED_MASK;