Preview of new Primitives menu and dialogs

[Fonte Boa]

<< I would suggest temporarily isolating the new primitive as being the only thing viewable on screen, until it is formally created >>

In the case Optigon implements the "absolute move" (and duplicates) session in the new primitive preview dialog, then i cant agree: for mechanic/arquitect purposes, it would be useful to visualize all the elements in scene.

If not, your suggestion would be a way to avoid new primitives being occlused by existant scene geometry.