Support completion while in the middle of a complex record

[thufschmitt]

Is your feature request related to a problem? Please describe.

Follow-up to #1514: when working on an AST of the form:

{
  x = foo.
  foo = { blahblah = 1 },
}

Nls isn't able to complete after foo.

Describe the solution you'd like

Provide completion despite the invalid syntax tree

Describe alternatives you've considered

ø

[thufschmitt]

I came across that again in a slightly different case:

{
  foo.<CURSOR>
} | { foo.bar }

Interestingly,

{
  foo.b<CURSOR>
} | { foo.bar }

works, probably because the second one is syntactically valid.