sv-placeholder for sortable lists without common ancestor

[punkchen]

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The sv-placeholder works great for single sortable list. However, when dealing with multiple sortable lists without common ancestor, it's not clear how to apply sv-placeholder such that the size of the partFrom and partTo lists remains unchanged.

Specifically, I have a 2D tile view structured in pseudo HTML below, it's a nested loop, each row is a sortable list. I want to drag a tile from one row to another. When I drag tile 'E' from the second row to the first row, I could get a placeholder at the starting of dragging, but as soon as the tile 'E' is dragged over to the first row, the placeholder disappears, and a new placeholder appears in the first row. What I want during the process is that both rows remain the same size, like auto-resizing.

For example, A B C D E F G H

dragging tile 'E', this is happening, A B C D "placeholder" F G H => A "placeholder" B C D F G H

I want , A B C D "placeholder" F G H => A "placeholder" B C D F G H