Member completion uses wrong qualifier

[auduchinok]

Consider the following example:

let f (s: string) =
    s.Trim()
    s.Trim()
    s.Trim()
    ()

It's expected that the member code completion is the same after each s.Trim() invocation, however, members are suggested in the first case only, and the next two cases suggest unqualified items:

Initially reported in RIDER-120178.