fix for unnecessary duplication of comment

src/services/refactors/convertArrowFunctionOrFunctionExpression.ts

@@ -149,6 +149,7 @@ namespace ts.refactor.convertArrowFunctionOrFunctionExpression {
         if (!variableInfo) return undefined;
 
         const { variableDeclaration, variableDeclarationList, statement, name } = variableInfo;
+        suppressLeadingTrivia(statement);
         const newNode = createFunctionDeclaration(func.decorators, statement.modifiers, func.asteriskToken, name, func.typeParameters, func.parameters, func.type, body);
         let edits: FileTextChanges[];
 

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_Modifier_Comment.ts

@@ -0,0 +1,19 @@
+/// <reference path='fourslash.ts' />
+
+//// // Do not add me second time
+//// export let foo = /*x*/a/*y*/ => {
+////    let b = 1;
+////    return a + b;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to named function",
+    actionDescription: "Convert to named function",
+    newContent: `// Do not add me second time
+export function foo(a) {
+    let b = 1;
+    return a + b;
+}`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_MultiDecl_Modifier_Comment.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+//// // Do not add me second time
+//// export let foo, bar = /*x*/(/*y*/) => 1 + 1;
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to named function",
+    actionDescription: "Convert to named function",
+    newContent: `// Do not add me second time
+export let foo;
+export function bar() {
+    return 1 + 1;
+}
+`,
+});