Autocomplete does not work for arguments after the first one in `@relation()`

Bug description

When authoring a schema in VSCode with the extension, if onDelete or onUpdate is the first argument in an @relation, autocomplete for referential actions works, but when it comes after another argument, it doesn’t and reverts to the buffer word completion.

How to reproduce

Expected behavior

Autocomplete works in that position.

Prisma information

Using a recent version of prisma-fmt (e6bd3dc12d849124a04c3a8e6bd9c194381afda3)

Environment & setup

• OS:
• Editor: VSCode
• Editor version:
• Extension version: e6bd3dc12d849124a04c3a8e6bd9c194381afda3

[tomhoule]

@@index and @@unique are going to take multiple arguments after we merge the constraint names work.

[pimeys]

It’s not directly related to referential actions. Even with the previous version, if you had fields as the first property, then no autocompletion would work on the second.