Ripple tool:

Phyllis: "So if I have 3 edits with 2 labels and an effect in the middle edit, using the left drag handle on the left side of that middle edit, and when I drag either right or left, the labels and effect do not correctly move (with Edit labels checked in Settings, of course)."

Phyllis, You are right. (The labels and effect do not correctly move: also Keyframes and Autos).

Phyllis: "The right drag handle works OK for me."

Yes, that's true.
I confirm everything you wrote.

Slip tool:
(With my brain switched) ;-P
Only when I drag left, the keyframes don't follows edits.
I added a screencast for the Feb 17 2019 release. I haven't tried the Dec 12 2018, sorry.
https://streamable.com/t2oqp

Thanks for all your time.
IgorBeg