From defd63b8badf2f37b3018d6fbe8a2b5bff21a93e Mon Sep 17 00:00:00 2001
From: Denis Zhdanov <Denis.Zhdanov@jetbrains.com>
Date: Fri, 15 Jul 2011 12:02:05 +0400
Subject: [PATCH] EA-28828 - IOOBE: CharArray.charAt

Corrected pasting at the document start
---
 .../editorActions/BlockIndentOnPasteTest.groovy | 17 +++++++++++++++++
 .../codeInsight/editorActions/PasteHandler.java |  2 +-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/java/java-tests/testSrc/com/intellij/codeInsight/editorActions/BlockIndentOnPasteTest.groovy b/java/java-tests/testSrc/com/intellij/codeInsight/editorActions/BlockIndentOnPasteTest.groovy
index 5fdbc7c1c108..f445112993c1 100644
--- a/java/java-tests/testSrc/com/intellij/codeInsight/editorActions/BlockIndentOnPasteTest.groovy
+++ b/java/java-tests/testSrc/com/intellij/codeInsight/editorActions/BlockIndentOnPasteTest.groovy
@@ -156,6 +156,23 @@ class Test {
      }
     }
 }\
+'''
+    doTest(before, toPaste, expected)
+  }
+
+  void testPasteAtDocumentStartColumn() {
+    def before = '<caret>'
+
+    def toPaste =
+    '''\
+          class Test {
+          }\
+'''
+
+
+    def expected = '''\
+class Test {
+}\
 '''
     doTest(before, toPaste, expected)
   }
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java
index 0b0f972a203e..bff12d06df89 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java
@@ -383,7 +383,7 @@ public class PasteHandler extends EditorActionHandler {
     final int i = CharArrayUtil.shiftBackward(chars, startOffset - 1, " \t");
     
     // Handle situation when pasted block doesn't start new line.
-    if (chars.charAt(i) != '\n') {
+    if (i > 0 && chars.charAt(i) != '\n') {
       int firstNonWsOffset = CharArrayUtil.shiftForward(chars, firstLineStart, " \t");
       if (firstNonWsOffset > firstLineStart) {
         CharSequence toInsert = chars.subSequence(firstLineStart, firstNonWsOffset);