From 9d9e5fa5464bd4e15697730a567393a85bd84e7f Mon Sep 17 00:00:00 2001
From: Joey Robichaud <jorobich@microsoft.com>
Date: Mon, 2 Nov 2020 12:41:32 -0800
Subject: [PATCH] Do not call updateBuffer if there are no changes.

---
 src/features/changeForwarding.ts | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/features/changeForwarding.ts b/src/features/changeForwarding.ts
index db16747d6..03390e510 100644
--- a/src/features/changeForwarding.ts
+++ b/src/features/changeForwarding.ts
@@ -14,16 +14,21 @@ function forwardDocumentChanges(server: OmniSharpServer): IDisposable {
 
     return workspace.onDidChangeTextDocument(event => {
 
-        let { document } = event;
+        let { document, contentChanges } = event;
         if (document.isUntitled || document.languageId !== 'csharp' || document.uri.scheme !== 'file') {
             return;
         }
 
+        if (contentChanges.length === 0) {
+            // This callback fires with no changes when a document's state changes between "clean" and "dirty".
+            return;
+        }
+
         if (!server.isRunning()) {
             return;
         }
 
-        const lineChanges = event.contentChanges.map(function (change): LinePositionSpanTextChange {
+        const lineChanges = contentChanges.map(function (change): LinePositionSpanTextChange {
             const range = change.range;
             return {
                 NewText: change.text,