Improve the comparison tooltip so that it reacts to pressing shift instantly, instead of requiring you to leave the item frame and come back.

You can see how AtlasLoot does it here: https://github.com/Hoizame/AtlasLootClassic/blob/8e99341e4e779328460bf7684c0d5b22ce50ddf1/AtlasLootClassic/Button/Item_type.lua