UI allows private components in group components but backend doesn't

[twagoo]

Transfered from Trac ticket #712

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Create a private component and another component (or profile) that uses this component. Move the top level component to a group but not the referenced component. Go to the group and edit the component you just moved there. Save it.

The operation will not be successful and, unless there are other errors, messages like the following appear (one line per referenced private component):

Failed to register: - referenced component cannot be found in the appropriate registry components: clarin.eu:cr1:c_1407745712016 (group registry) 2
 - referenced component cannot be found in the appropriate registry components: clarin.eu:cr1:c_1407745712061 (group registry) 2
 - referenced component cannot be found in the appropriate registry components: clarin.eu:cr1:c_1407745712051 (group registry) 2
 - referenced component cannot be found in the appropriate registry components: clarin.eu:cr1:c_1407745712031 (group registry) 2
 - referenced component cannot be found in the appropriate registry components: clarin.eu:cr1:c_1407745712058 (group registry) 2

Notice that the editor allows dragging in private components and that the browser does not force the user to push the entire chain of private components when moving to a group. This should be made consistent (probably by not allowing mixed private/group hierarchies in the UI).

Reported by Alexander König (MPI-PL), verified in 1.14.1 at http://catalog.clarin.eu/ds/ComponentRegistry by twagoo.

[twagoo]

Solution can (should) be to not allow 'private' to be selected in components panel in editor