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Differentiate Already Memorized Spells in Scrolls for Sale/Loot
Not sure if it's possible, likely, or seen as advantageous to others, but I would find it helpful to see which spells the selected character already has memorized when looting or browsing through a merchant's wares. Closing the merchant dialog and then opening the spellbook to check for each spell can become a bit tedious as the spellbook fills up.
Perhaps a green highlight?