Fix placement of indent for @ts-ignore comment (#24143)

Author: Andy

src/services/textChanges.ts

@@ -360,7 +360,8 @@ namespace ts.textChanges {
             // Otherwise, add an extra new line immediately before the error span.
             const insertAtLineStart = isValidLocationToAddComment(sourceFile, startPosition);
             const token = getTouchingToken(sourceFile, insertAtLineStart ? startPosition : position, /*includeJsDocComment*/ false);
-            const text = `${insertAtLineStart ? "" : this.newLineCharacter}${sourceFile.text.slice(lineStartPosition, startPosition)}//${commentText}${this.newLineCharacter}`;
+            const indent = sourceFile.text.slice(lineStartPosition, startPosition);
+            const text = `${insertAtLineStart ? "" : this.newLineCharacter}//${commentText}${this.newLineCharacter}${indent}`;
             this.insertText(sourceFile, token.getStart(sourceFile), text);
         }
 

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile_tsIgnore_indent.ts

@@ -0,0 +1,19 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @checkJs: true
+
+// @Filename: /a.js
+////{
+////    a;
+////}
+
+verify.codeFix({
+    description: "Ignore this error message",
+    index: 0,
+    newFileContent:
+`{
+    // @ts-ignore
+    a;
+}`,
+});