More django-mptt goodness: FilteredSelectMultiple m2m widget

If you are using django-mptt to manage content (eg heirarchical categories) then it needs a bit of help to make a nice admin interface. For many-to-many fields, Django provides the quite nice FilteredSelectMultiple widget (a two-pane selection list with search box) but it only renders ‘flat’ lists… if you have a big category tree it’s going to be confusing to know what belongs to what. Also, list items are sorted alphabetically by the js, which won’t be what you want.

In this post I’ll be extending FilteredSelectMultiple to show the tree structure in the list:

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