Autocomplete is still annoying in some cases

[gjuchault]

Hello,

This is related to #9504

• VSCode Version: 1.25.1
• OS Version: macOS Mojave 10.14

Steps to Reproduce:

1. Create a new JS file. Let's say you're working with Redux or vuex
2. Start typing:

export const SET_FOO = (state

If I press comma, I get:

export const SET_FOO = (ListeningStateChangedEvent,

If you start typing:

function foo(state

and press comma, everything is fine, autocomplete is not replacing the parameter. Edit: so it seems that's just arrow functions / ES2015+ features that are not handled correctly

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

[mjbvz]

Duplicate of #54386