Fix dupe when shift-clicking crafting results out of terminal

src/main/kotlin/net/shadowfacts/phycon/block/terminal/CraftingTerminalScreenHandler.kt

@@ -1,6 +1,6 @@
 package net.shadowfacts.phycon.block.terminal
 
-import alexiil.mc.lib.attributes.item.ItemStackCollections
+import net.minecraft.entity.player.PlayerEntity
 import net.minecraft.entity.player.PlayerInventory
 import net.minecraft.inventory.CraftingInventory
 import net.minecraft.inventory.CraftingResultInventory
@@ -94,6 +94,36 @@ class CraftingTerminalScreenHandler(
 		terminal.requestItemsForCrafting(maxAmount)
 	}
 
+	override fun transferSlot(player: PlayerEntity, slotId: Int): ItemStack {
+		if (slotId == resultSlot.id && resultSlot.hasStack()) {
+			val craftingResult = resultSlot.stack
+			val originalResult = craftingResult.copy()
+
+            // todo: CraftingScreenHandler calls onCraft, but I don't think that's necessary because onStackChanged should handle it
+			craftingResult.item.onCraft(craftingResult, player.world, player)
+
+			if (!insertItem(craftingResult, playerSlotsStart, playerSlotsEnd, true)) {
+				return ItemStack.EMPTY
+			}
+            resultSlot.onStackChanged(craftingResult, originalResult)
+
+			if (craftingResult.isEmpty) {
+				resultSlot.stack = ItemStack.EMPTY
+			}
+
+			if (craftingResult.count == originalResult.count) {
+				return ItemStack.EMPTY
+			}
+
+			val taken = resultSlot.onTakeItem(player, craftingResult)
+			player.dropItem(taken, false)
+
+			return originalResult
+		} else {
+			return super.transferSlot(player, slotId)
+		}
+	}
+
 	// RecipeType.CRAFTING wants a CraftingInventory, but we can't store a CraftingInventory on the BE without a screen handler, so...
 	class CraftingInv(val handler: CraftingTerminalScreenHandler): CraftingInventory(handler, 3, 3) {
 		private val backing = handler.terminal.craftingInv