Comment 1 for bug 1850555

Have a look at eg-multi-select, whose current sole use is for selecting a set of item locations in the carousels admin page. Obviously, a dedicated eg-copy-location-select (or should it be called eg-item-location-select nowadays?) would be for selecting exactly one item location, but hopefully there can be a bit of cross-pollination. At the very least, we should make sure that styling is consistent.

Also, I note that on account of config.circ_matrix_matchpoint and the like that it should be possible to use the component to set the item location to null.