Thanks Jacob.
We have the functionality of the selects working fine, it's just finding a
way to make it clear to the user that the selected options that are
filtered out are still in fact selected and will be sent as such in the
POST.
Thanks for the info though, I'll take look.
On Monday,
I'm currently looking in to adding a filter to the right hand column of the
`filter_horizontal`/`FilteredSelectMultiple` widget to allow users to
filter down the list of selected options.
The PR has been created, and is nearly there, but the question has been
raised as to whether it's intuitive