Better drag and drop preview

[christofmuc]

This probably comes after multi-select in the grid - when you drag multiple patches (you already can when you drag a list), it should be easy to see where it will end up when you let the mouse go.

https://forum.sequential.com/index.php/topic,8073.0.html

• drag and drop to everywhere... the interface invites and begs for this.
• along with multiple selection via shift (sequentially) or ctrl (individually) before dragging, and having it parse out in the target list or column by visually previewing the sort and landing program slots before you let go of the mouse button.