Absolutely this should be a thing. It's already baffling that someone signed off on forcing this to be positive numbers only.

Kinda surprised this isn't more upvoted. It's already possible to do this with repeat grid after all.

Negative Stacking combined with repeat grids would offer a great solution to creating tables with gridlines.

1. Create a box with the content for the table cell.
2. Stack multiple cells into a row.
3. Set stacking to -1 so inside borders aren't doubled (1px rectangle borders stay 1px on internal "cells")
4. Repeat grid to create additional rows.

Now you can easily reorder the columns, and stacking allows you to have columns of different widths.

I came across a situation today where I had a row of tabs that I turned into a horizontal stack, so that I could easily move them around. But I wanted the tabs to clip into one another with a negative margin, and I realized that's incompatible with the stack feature. I'm not sure what the reason is behind this limitation.

I was hoping for more people to upvote this but so few votes since last Oct.
I was wondering why "Repeat Grid" gets the negative value but not "Stack".

+1 Negative margins are a common and useful technique frequently used in front end layouts.

It is frustrating to need to break up a stack only to tighten some elements closer together.;

Kudo's to the creator of the Stacking/Padding functions.

As an addon feature it would be immensely helpful for the Stacking feature to allow negative values for the intervals between stacked items.

We have many designs that show up as overlapping objects.

The ability to use negative values for spacing already exist for text grids.
Can we get the same behavior for Stacking elements as well?