System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Worked: (optional)

Impossible to deselect loopedge selection with emilate 3 button mouse actived

Select 3 edge with doubleclick ,try to use shift or double click on an edge loop to deselect an edge loop: don't work

If I'll remove emulate 3 button mouse in input it work.