From fd684a2ac5736a9468dd606a56a7f13498ddab93 Mon Sep 17 00:00:00 2001
From: Henning Dieterichs <hdieterichs@microsoft.com>
Date: Mon, 18 Sep 2023 12:03:58 +0200
Subject: [PATCH] Fixes #193194

---
 .../diff/defaultLinesDiffComputer/computeMovedLines.ts      | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/vs/editor/common/diff/defaultLinesDiffComputer/computeMovedLines.ts b/src/vs/editor/common/diff/defaultLinesDiffComputer/computeMovedLines.ts
index 6436ad0d9e097..2d25234c4e5f4 100644
--- a/src/vs/editor/common/diff/defaultLinesDiffComputer/computeMovedLines.ts
+++ b/src/vs/editor/common/diff/defaultLinesDiffComputer/computeMovedLines.ts
@@ -196,6 +196,9 @@ function computeUnchangedMoves(
 		for (extendToTop = 0; extendToTop < linesAbove; extendToTop++) {
 			const origLine = move.original.startLineNumber - extendToTop - 1;
 			const modLine = move.modified.startLineNumber - extendToTop - 1;
+			if (origLine > originalLines.length || modLine > modifiedLines.length) {
+				break;
+			}
 			if (modifiedSet.contains(modLine) || originalSet.contains(origLine)) {
 				break;
 			}
@@ -213,6 +216,9 @@ function computeUnchangedMoves(
 		for (extendToBottom = 0; extendToBottom < linesBelow; extendToBottom++) {
 			const origLine = move.original.endLineNumberExclusive + extendToBottom;
 			const modLine = move.modified.endLineNumberExclusive + extendToBottom;
+			if (origLine > originalLines.length || modLine > modifiedLines.length) {
+				break;
+			}
 			if (modifiedSet.contains(modLine) || originalSet.contains(origLine)) {
 				break;
 			}