How do I add edges?

[darabos]

There are operations that create new edges, like "Connect vertices on attribute". But these (always?) replace the existing edge bundle instead of adding to it. Maybe we could reconsider that.

But let's say they replace the edge bundle. How do I combine it with the preexisting edges? "Graph union" followed by "Merge vertices by attribute" kind of works. But it discards all the vertex attributes! I guess I can add them back with SQL...

Is there a better way? If there isn't, shouldn't there be?

[xandrew-lynx]

Other workaround options:

• Maybe graph rejoin works? Probably not.
• You could specify merges one by one in the merge vertices box.

Longer term, it would be nice to solve this somehow. Maybe we need an edge union box. Or, as Dani points out, we could realize in the Graph Union box that the two vertex sets are the same (or compatible ala Graph Rejoin?) and then offer an edge only union.