Operating system: Debian Linux
Graphics card: gtx 1060
Broken: 2.80, latest 2.8 Git branch
Worked: 2.79b release
Short description of error
In Blender 2.8 it's not possible anymore to override the space_time.py file.
Exact steps for others to reproduce the error
Move on any button of the panel header (timeline) and edit source to open the space_time.py.
Any changes made on the file are not visible.