Fix the inset tool so that corners do not cross/overlap each other.

[sam_large]

Ideally, there would be an option to just scale the entire shape down so that topology is maintained rather than just pushing verts around.

[Kranos_Orphydian]

I've made a more general a rich illustrated idea about my vision of the Inset Tool in which I've mentioned this issue as well:

[Inset Tool] A full-fledged tool on par with competition: Offset Even, Edge Rail, Quad Corners, Auto...