System Information
Operating system: Windows 10 64bit
Graphics card: Radeon RX Vega
Blender Version
Broken: 2.80 0fe5a789837
Short description of error
Trying to clamp some vertex/edge while sliding them using edge slide doesn't work properly. The tooltip says you can turn off clamping with either Alt or C, however using C doesn't seem to do anything at all for me. I tried using Alt to do it instead and while that actually works there's some problems with that as well as I can't confirm the slide with the leftclick (even though I can do that if I don't hold down Alt). I had to confirm my operation with enter instead, which really shouldn't be necessary.
On top of that the old behavior of having the clamping be a toggle instead of something you hold down seemed more intuitive and easier to use, but I know that's very subjective.
Exact steps for others to reproduce the error
Add a default cube
Select one or more vertices
Start sliding the selection with GG
Turn off clamp with Alt or C
Try to confirm your operation with LMB
Observe the problems