allow boxes to be close but not joined

[topshef]

 how to have 2 boxes
┌───────┐
│       │  not join
└───────┘
           like this
    ┌────────┐
    │        │
    └────────┘

┌───────┐
│       │  but closer
└───┬───┤
    ├───┴────┐
    │        │
    └────────┘

here is a hack of what's needed
done with a regular text editor
┌───────┐
│       │  
└───────┘
    ┌────────┐
    │        │
    └────────┘