From 8fde3d98427065b5261cda8c5ad003a2bdc575bd Mon Sep 17 00:00:00 2001
From: Anton Leherbauer <anton.leherbauer@windriver.com>
Date: Wed, 25 Apr 2007 08:27:30 +0000
Subject: [PATCH] Fix for 183653: While in CDT perspective CTRL^X of 1000 lines
 out of a 1500 line source file causes error

---
 .../org/eclipse/cdt/internal/ui/LineBackgroundPainter.java | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/LineBackgroundPainter.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/LineBackgroundPainter.java
index 384b4c86996..26a46ec8003 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/LineBackgroundPainter.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/LineBackgroundPainter.java
@@ -400,8 +400,11 @@ public class LineBackgroundPainter implements IPainter, LineBackgroundListener {
 	private int getTopIndexStartOffset() {
 		if (fTextWidget != null) {
 			int top= fTextWidget.getTopIndex();
-			top= fTextWidget.getOffsetAtLine(top);
-			return getDocumentOffset(top);
+			// https://bugs.eclipse.org/bugs/show_bug.cgi?id=183653
+			top= fTextWidget.getOffsetAtLine(Math.min(fTextWidget.getLineCount() - 1, top));
+			if (top >= 0) {
+				return getDocumentOffset(top);
+			}
 		}
 		return -1;
 	}