Completion hits too complex in chained `+` in result builder

[hamishknight]

The following hits "too complex" and produces no completions:

import SwiftUI

func foo() -> some View {
  Group {
    Group {
      Group {
        Text("")
        + Text("")
          .foregroundColor(Color(""))
        + Text("")
        + Text("")
        + Text("")
          .#^CC^#
      }
    }
  }
}

The expression without .#^CC^# does type-check, although it takes several seconds

[hamishknight]

Looks like this regressed slightly more with #82574, one additional completion position from ACHNBrowserUI is now hitting the above issue, and the following case is now also timing out:

import SwiftUI

struct S {
  var x: String?
}

struct V: View {
  var s: S

  var body: some View {
    Group {
      Text("\(s.x.map { $0.isEmpty ? "" : " · \($0)" } ?? "")\(s.x.map { $0.#^CC^# ? " · " + NSLocalizedString("", comment: "") : " · \($0[...]) " + NSLocalizedString("", comment: "") } ?? " · " + NSLocalizedString("", comment: ""))")
          .font(.subheadline)
          .foregroundColor(.red)
    }
  }
}