cubicweb-collaboration #10648990 Cloned collaborative entity is in an incoherent state if created with frozen=True [open]
In the case where frozen is set to True on clone creation, can_write is set for the creator/ owners anyway, which is not coherent with frozen=True.
We should deny the possibility to create a collaborative entity with frozen=True, because it is meaningless.
We should also modify the 'copy' view (linked from the copy action of the cube) to set the frozen value to False and hide it.
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