Fix Auto Insert XML Comment Issue (#6130)

* fixes

* Update src/lsptoolshost/roslynLanguageServer.ts

Co-authored-by: David Barbet <[email protected]>

---------

Co-authored-by: David Barbet <[email protected]>

Author: akhera99

src/lsptoolshost/roslynLanguageServer.ts

@@ -972,9 +972,12 @@ async function applyAutoInsertEdit(
     token: vscode.CancellationToken
 ) {
     const change = e.contentChanges[0];
-
-    // Need to add 1 since the server expects the position to be where the caret is after the last token has been inserted.
-    const position = new vscode.Position(change.range.start.line, change.range.start.character + 1);
+    // The server expects the request position to represent the caret position in the text after the change has already been applied.
+    // We need to calculate what that position would be after the change is applied and send that to the server.
+    const position = new vscode.Position(
+        change.range.start.line,
+        change.range.start.character + (change.text.length - change.rangeLength)
+    );
     const uri = UriConverter.serialize(e.document.uri);
     const textDocument = TextDocumentIdentifier.create(uri);
     const formattingOptions = getFormattingOptions();