Operating system: Windows 10
Graphics card: GTX970
Broken: 2.80, 26d5a3625ed 2018 11 29
Short description of error
When You are in Object Mode this option should make whole scene transparent, but in Edit Mode only for the currently edited object or objects.
There is a lot of inconvenience at the moment, and if You change X-Ray value in shading popup, they don't apply and reset after exiting Edit mode.
X-Ray value should be saved separately for Object Mode and for Edit Mode.
Exact steps for others to reproduce the error