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