Missing an old feature using vertices

[Fonte Boa]

I made a anterior confuse "answer" here: forgive me.

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Bazooca, you can do what you intend using Tweak | Slide keeping F1 hold during the operation: Wings3D will collapse any edge which lenght reach the value 0 (zero). In other words, using Tweak | Slide keeping F1 hold, when you reach the neighbour vertex, Wings will weld them automatically.