Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.71
Broken: version: 2.80 (sub 72), branch: blender2.7, commit date: 2019-05-26 22:34, hash: rBd525c76003b3
Short description of error
With the default keymap, Shift+RMB and drag on a connection on the Node Editor creates a reroute node, and Ctrl+RMB drag cuts the connections... but if Node Wrangler addon is enabled, Ctrl+RMB drag enables the "Lazy connect" option of Node Wrangler, overwriting the connection cutting shortcut. I understand that it's an addon, but being that it comes bundled in Blender and given that it's arguably necessary to get the most out of the Node Editor, it shouldn't create conflicts like this.
Exact steps for others to reproduce the error
Works in any file. Just try to cut connections between nodes using Ctrl+RMB drag with Node Wrangler addon enabled.