Move action doesn't check for possible 'same name' siblings

It is possible to create 'same-name' siblings, at least in the Pages app, and at least in Magnolia 5.4.8. Please see attached images, and connected SUPPORT-6660.

While technically the siblings do not have the same name in the system ('page', 'page[2]' will be created, for example), the user is provided no visual cues to that effect (sees 'page', 'page'), and is permitted to create an Nth page with the 'same name' as an existing page.