Improve reordering assets in grid mode
Most often, I reorder assets with the asset list only one column wide because reordering with it pulled out to multi-column is very confusing. The order of the assets run across each row and then down to the next column, which is fine, however, the drop placement is indicated as being a horizontal blue line ABOVE an asset, rather than between the LEFT/RIGHT sides of two assets. Since, for example, Assets 4 and 5 in the list would be next to each other rather than one on top of the other, it would make more sense for the blue bar to be vertical and in between the left/right sides of the two assets. When the list is only one column wide it does make most sense to have a horizontal line between the assets to show the drop spot, but for 2+ columns, a vertical indicator would be easier to understand.