Github user tbouron commented on the issue:
https://github.com/apache/brooklyn-ui/pull/99
You are right, elevation doesn't necessarily means draggable. What I meant
is that MD is based on our physical world, for instance:
- the canvas is a sheet of paper
- the side panel are smaller sheets of papers on top of that
- each items on the palette could be either directly drawn on the side
panel paper or added as small squares of paper. In this case, we want to drag
items onto the canvas, therefore taking items and dragging them onto another
container. It then should be laid out as small square of paper.
MD defines "each layer as a separate piece or UI". These layers are
represented by the concept of elevation, that is why I'm saying should keep the
box shadow.
I get that you have a strong preference to change the styling to a border
but as you said, that is subjective compare to (I hope) the explanation I gave
above and the consistency that a design system such as MD brings to the table.
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