Operating system: Windows 7 (64 bit)
Graphics card: Radeon HD 8670D
Broken: 2.80, 69b2f5268114, blender2.7, 2019-02-10, as found on the splash screen
Short description of error
When a node editor is inside of a node group, an "Interface" panel is visible in the right-side shelf in all tabs (expected behavior is that it's only visible in the Node tab)
Exact steps for others to reproduce the error
Open the attached file and run the script. A "Test Tab" tab will appear in the node editor, and it will contain "Node Editor Test" panel and "Interface" panel.