Reorder Categories
In order to be really useful (especially for larger grocery trips), this really needs the ability to reorder categories (or a separate "aisle" property that you can order items by) so that you can set them in the same order as the actual aisles in a store. The order would of course need to be tied to each individual list/template since you can have different stores with different aisles.
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Grocery Shopping List - Listick