Operating system: Win 7
Graphics card: 1060 GTX
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Short description of error
There are double entries for Select in the Node Editor section in the Keymap of Blender 2.8.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Open User Preferences, Open Node Editor(Global) Section. Have a look for the Select pairs in the input manager.
In Blender 2.79 we had action and select mouse for each select pair. Now both entries are each mapped to Left Mouse. And are identical.
When you deactivate the second entry of a pair, then it hides away like you would delete it instead of becoming deactivated. So Blender 2.8 seems to be in trouble with this two identical entries.