Bug: When codeblock view set to collapse true, opening one node opens all nodes underneath

[ybalkind]

Describe the bug

When I set a codeblock to collapse true, then I expand one of the nodes, all the nodes underneath it also open up as well. Expected behaviour is that expanding a node just expands one level down and I manually expand nodes underneath one by one.
For a very big hierarchy it defeats the purpose of "collapse: true" if opening one node opens up all underneath

(left out the rest of the Bug template as seems unnecessary here)

[edongashi]

A root page becomes impossible because of this bug due to the overwhelming number of pages you get as soon as you open one category. I hope it gets addressed soon.

[charleshan]

I was able to fix this problem by changing the default open value of NestedEdgeList to false. It creates a side effect where "Expand" button only expands 2 levels deep. I don't mind this because I think expand all becomes messy with more than three levels down.

What do you think @SkepticMystic?

Here's the change I made: charleshan@3dfcdc5