After changing single leaf in graph, all visualizaitons are reloaded twice

[farmaazon]

In the project below, after changing the leaf at on the left (using numeric input), all visualizations are invalidated and reloaded. Then, after zooming/panning, all visualizations are reloaded again.

Bookclub_17_01.zip

[farmaazon]

It seems to be an IDE's fault. Seemingly, we re-attach every visualization on any AST change.

[farmaazon]

The problem is that every node id is changed on the widget change (and then again, without my interaction - perhaps some pingback from y-docs server?)

The regression was introduced in a04385a - before we kept the nodes, and no visualization was re-attached.

[farmaazon]

The problem seems to be already fixed on #8893

Let's merge it asap, then!