Add a way to link entity-paths across spaces such as for point-correspondences

[jleibs]

Sometimes the same "thing" is logged at multiple entity-paths and multiple space views. In this case instance-ids should be considered 1:1 between the two paths.

We need a way to indicate to the UI that hovering or selecting one of these should also hover/select the corresponding entities.

This is very important to be able to show matched point-correspondences across 2D frames or between 2D and 3D spaces.

[roym899]

Some thoughts on this after working on #4541

This would also be nice to have for words / tokens in text (currently only text -> entity links exist, with highlighting not working, see #4538), various slices in tensors (i.e., highlight one row for each point in a point set), etc.

It should also be possible to have multiple links for one entity. For example, one point could be linked to another point set, a row in a tensor, and a word in a text. All should be highlighted when hovering over any other.

I think in some cases, it might be nice to allow setting the link direction.

[demul]

any progress on this feature request?

[Wumpf]

@demul Unfortunately not so far. There's various aspects to this and how ui interactions should play out is a bit hazy at this point. If you have any specific expectations on what this should look like please share, maybe there's some subset we could get to sooner