Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Short description of error
when in edit mode with multiple vertices selected, sliding the vertex weights slider in the N panel only affects the active vert. It needs to affect all selected vertices so we can view in realtime how modifiers that use those vertex groups are reacting to the vertex weight value change.
Exact steps for others to reproduce the error
open this file and then choose the bottom mesh, go into edit mode, select some vertices, and then use the vertex weights sliders in the n panel to modify the effect of modifiers in realtime.