Nifty (attn @licode this is probably useful at BNL).

This would probably do better as a stand alone repo under the mpl organization (which decouples you from our glacial release cycle 😉 )

This might also fit in @joferkington 's mpldatacursor?

Have only skimmed this, but might have some interaction with @blink1073 's widget work?

Your release cycle don't bother me. I didn't planed to update this really intensively 😉.

I not tested interactions with packages other than MPL. There is maybe some possible conflicts on keys shortcuts.

I think so. Good to know this feature.

@tacaswell, yeah, these could certainly overlap (especially for the advanced marker types), if I ever get around to finishing #5786.

I think this kind of feature belongs more to a third-party package (there is some overlap with mpldatacursor and mplcursors -- disclaimer, I wrote the later).
A dependency, even optional, on skimage is a non-starter IMO.
This would also need some testing.

Unless someone objects, I will close the PR.

You can close this PR. I see not objects.

Note: I'll not make a third party package for this. If someone is interested by getting this, no problems, I can eventually help to add this to another package. If not, I'll delete my forked repository when this PR will be closed.

Closing based on lack of activity or objections against closing...