Docker is spewing UdevQt: unhandled device action "move"

(I hope this is the right place for what appears to be an UdevQt bug.)

While running `docker build`, this error message appears multiple times:

    UdevQt: unhandled device action "move"

STEPS TO REPRODUCE

1. Put this in a Dockerfile in its own directory:

    FROM alpine:3.8
    RUN echo hello
    RUN echo world

2. Run `docker build .` from within the directory

OBSERVED RESULT

    Sending build context to Docker daemon  2.048kB
    Step 1/3 : FROM alpine:3.8
    ---> c8bccc0af957
    Step 2/3 : RUN echo hello
    ---> Running in b2857dfcbb26
    hello
    UdevQt: unhandled device action "move"
    Removing intermediate container b2857dfcbb26
    ---> 75635d880095
    Step 3/3 : RUN echo world
    ---> Running in 8718e2e15b17
    world
    UdevQt: unhandled device action "move"
    Removing intermediate container 8718e2e15b17
    ---> 84fa6aaab150
    Successfully built 84fa6aaab150

EXPECTED RESULT
The «UdevQt: unhandled device action "move"» lines should obviously not be there.