Does not support flex/grid/margin around the sortable-items

[NullVoxPopuli]

Describe the bug
When a layout of items is contained within a flex/grid (with gap), and dragging begins, all items collapse the gap via translateY. This is because this code
https://github.com/adopted-ember-addons/ember-sortable/blob/master/addon/modifiers/sortable-group.js#L635-L639
is only calculating translateY from the heights of the surrounding elements, which excludes the gap.

Expected behavior
No shift upon drag-start

[ghost]

Is there a workaround until this is fixed? I have this exact problem.

[joe-reich]

I worked around this by adding a margin instead of using flexbox with a gap.