When positioning mesh objects (and other objects) it can be difficult to see when an object intersects another:
Would it be possible to have a different color from selected but hidden lines? Like this:
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I like that you have editing possibilities Wim! 
Thanks for fixing the category.
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Hi @Holo, it might help to enable shade highlight selected meshes to see the intersections better:
I guess what is shown in your second picture is possible too, but quite expensive as it requires to split the meshes on the fly in order to apply different wireframe colors.
c.
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