F3 + I is a useful short cut. If you look at a block, you get setblock command that places that blocks at that position with all its data. If you do this on a mob you copy a summon command to clip board that summons an entity with the same data and at the same position. My idea is that it also should work on items. So if you press F3 + I while the mouse is above and item, it should create a replaceitem command that puts the same item at that slot. For example if you have an item in a chest, it should give you a replaceitem command that places that item in that chest. In inventory it should place that item in that slot in your inventory. This would be useful. If you want to quickly put an item at the exact same slot you could simply do F3 + I.
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