celllayout: editor doesn't show the full node vertically

[alamqadem]

Description

Given an indent collection containing an horizontal collection, if the internal collection is large enought this is reported on a new line.

Now after a certain size the editor doesn't display the full node, in fact the scroll-bar doesn't allow to scroll down to see the last part of the node.
I suspect that the height of the resulting node it's not calculated correctly (RootConcept).

Disabling the LayoutInterceptor the node is shown correctly.

Reproducer

I've attached a reproducer in the following branch bug/celllayout-cell-height-not-correct based on maintenance/mps20213.

[alamqadem]

Using the Editor Cell Explorer I can check the height calculated for the cell with the LayoutInterceptor on, which is 84.

And without the interceptor active, I get 105.