Since rBb279fef85d1a, the nodes properties for geometry nodes using a
texture are displayed in the Properties Editor.
It was possible to create recursive nodetrees when choosing the 'root'
nodegroup in the node link menu though leading to a crash.
Now poll if a group node of a particular node could actually be added to
the current tree.
Also check if the tree types actually match.
Note there is still a problem with displaying the geometry node here
- list of compatible nodes with a matching socket is still empty, see D10673