"Move to a new file" quick fix won't properly separate default and named imports and leaves dangling comma

[ChristianIvicevic]

• VSCode Version: 1.33.1
• OS Version: Windows 10 1809

Steps to Reproduce:

1. Install the debug and @types/debug packages in a fresh typescript project.
2. Create a file with the following content:

import debug, { Debugger } from "debug";

export const log = debug("app");
export const foo = (logger: Debugger = log) => 0;

3. Run the "Move to a new file" quick fix on the foo object.
4. You are left with a dangling comma in the first line:

import debug, from "debug";

export const log = debug("app");

Does this issue occur when all extensions are disabled?: Yes

[mjbvz]

Confirmed with TS 3.5.0-dev.20190501