How to reproduce:
1. Open the attached project
2. Go to Edit --> Project Settings -->Player
3. Change Color Space from Gamma to Linear (or vice versa)

Expected result: Color Space is changed, Inspector window does not flicker
Actual result: Color Space is changed, Inspector window flickers while changing

Regression introduced with - 2018.2.0a3
Reproducible with - 2018.2.0a5, 2018.2.0a3
Not reproducible with - 2018.2.0a2, 2018.1.0b11

Note - Sometimes flicker happens on other Editor windows, or does not happen at all, usually re-opening the editor helps to reproduce the issue

Reproduced with:
Windows 10 Pro, AMD FX(tm)-8350 (8 core) 4.00 GHz, 8 GB, AMD Radeon (TM) R7 360
Windows 10 Pro, Intel(R) Core(TM) i5-7500 CPU @3.40GHz 3.41 GHz, 8 GB, AMD Radeon Sapphire Dual-X R9 270X OC 4 GB

Could not reproduce on:
Windows 10 Pro, Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz 3.20GH, 16GB, NVIDIA GeForce GTX 760
macOS 10.13.3, AMD Radeon HD 6490M