From cd494f78668940df07586d7e54749028d71f73f5 Mon Sep 17 00:00:00 2001
From: James Allen <james@sharelatex.com>
Date: Tue, 8 Nov 2016 17:57:23 +0000
Subject: [PATCH] Update ChangesTracker to handle delete edge case

---
 .../aceEditor/track-changes/ChangesTracker.coffee           | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/services/web/public/coffee/ide/editor/directives/aceEditor/track-changes/ChangesTracker.coffee b/services/web/public/coffee/ide/editor/directives/aceEditor/track-changes/ChangesTracker.coffee
index fed7605ba4..7bc5d328bd 100644
--- a/services/web/public/coffee/ide/editor/directives/aceEditor/track-changes/ChangesTracker.coffee
+++ b/services/web/public/coffee/ide/editor/directives/aceEditor/track-changes/ChangesTracker.coffee
@@ -277,7 +277,11 @@ define [
 			for change in remove_changes
 				@_removeChange change
 			
-			op.d = @_applyOpModifications(op.d, op_modifications)
+			# Copy rather than modify because we still need to apply it to comments
+			op = {
+				p: op.p
+				d: @_applyOpModifications(op.d, op_modifications)
+			}
 			if @track_changes and op.d.length > 0
 				@_addOp op, metadata
 			else