To reproduce:
1. Create a new project
2. Create an empty gameobject
3. Select the gameobject and Ctrl + D (Cmd + D) about 20 times
4. Repeat the following steps for each duplicated object one at a time:
4.1. Right click its entry in the Hierarchy and select Rename
4.2. Enter a new name
4.3. Without pressing enter to commit the new name, begin step 4.1 on the next object

Expected result: Rename of first object is committed, next object is selected, and text field for next object is active and editing

Actual result (macOS): Rename of first object is committed, next object is selected, but text field for next object is not active and editing, hierarchy window has lost focus (i.e. selected object has gray background instead of blue)

Actual result (Windows): Renaming is not consistent, it does not work about once every third time

Notes:
This process should also be tested against renaming in the Project view.

Reproduced with: 5.6.5f1, 2017.1.2p4, 2017.2.1p1, 2017.3.0p1, 2018.1.0b1