Auto completion doesn't show needed information

Number:rdar://37782818 Date Originated:22/02/2018
Status:DUPLICATE OF 8446920 Resolved:
Product:Xcode Product Version:9.2
Classification:Bug Reproducible:Always
When two methods have similar signatures, auto completion does not provide enough information to distinguish those two methods. 

Steps to Reproduce:
1. Open the attached project.
2. Open `ViewController.m` in Xcode
3. In `viewDidLoad` type in `[self am` and wait for the auto completion.

Expected Results:
Auto completion lets distinguish between the two methods. (Xcode 6 or so did insert a preview into the editor. That was perferct!)

Actual Results:
It's not possible to distinguish the two methods in the popup. Only solution is to select one of the suggestions and see if it is the correct one.

Version 9.2 (9C40b)

MacBook Pro 2015, macOS 10.12.6


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