Comment 6 for bug 2042879

Here's a branch with the revamped Shelving Location Groups admin screen:
https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/sleary/LP2042879-shelving-location-groups-admin-accessibility

This doesn't address the sorting issue Beth mentioned. Thank you for filing that separately, Beth!

It does fix the duplicate shelving locations in the two lists on the right (thanks to Mike!), as well as all the keyboard navigation issues noted in the bug description.

It also changes the way positions are updated to prevent the position numbers from ballooning as you rearrange the groups. It now updates only the positions between the first and last group affected by the drag and drop, rather than everything from the first group onward. This should be much more efficient when there are a lot of groups.