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http://www.w3schools.com/tags/tag_optgroup.asp
(My understanding of) PR#324's way:
- German Cars - Audi
- German Cars - Mercedes
- Swedish Cars - Saab
- Swedish Cars - Volvo
OPTGROUP way:
German Cars
- Audi
- Mercedes
Swedish Cars
- Saab
- Volvo
(In the example, country is community, and manufacturer is the collection).
(This might be a new Jira ticket), but lastly, I have made some performance improvements for loading that list, the gist of which can be seen at: https://github.com/osulibraries/DSpace/commit/61039c5572f29283127bc6e4fa1d1f729440d63d#diff-1
Current implementation is to get all collections in the site, and then one-by-one compare the current user to see if they have submit powers. My algorithm, says, get all permissions for submit that the user has, and then add those collections to a list. If you have *A LOT* of collections like my site 2000 collections, the speed up takes you from 30 second load to 1 second load.