Multiselectors handle comma-separated lists badly

[teceler]

You'd think, since we display things like tags and access lists as comma separated lists, that pasting them into the multiselect would work. no. it treats it as one tag/username/etc.

Fixing this would probably need to handle the possibility of a comma in a username or tag but if we're displaying them that way we should think about that anyway.

[Throne3d]

Looks like the comma tokenizer stuff only works on freeform entries: https://select2.org/tagging#automatic-tokenization-into-tags

I tried adding tokenSeparators: [','], to the configuration but it ignored it for the user entries. Maybe there's some way to hook into the paste event and handle that specifically, or some other event for the input search field for select2?