Make UI for blueprint unlocking behave.

src/main/java/emu/grasscutter/game/managers/ForgingManager/ForgingManager.java

@@ -48,11 +48,15 @@ public class ForgingManager {
 		// Determine the forging item we should unlock.
 		int forgeId = Integer.parseInt(blueprintItem.getItemData().getItemUse().get(0).getUseParam().get(0));
 
+		// Remove the blueprint from the player's inventory.
+		// We need to do this here, before sending ForgeFormulaDataNotify, or the the forging UI won't correctly
+		// update when unlocking the blueprint.
+		player.getInventory().removeItem(blueprintItem, 1);
+
 		// Tell the client that this blueprint is now unlocked and add the unlocked item to the player.
-		this.player.sendPacket(new PacketForgeFormulaDataNotify(forgeId));
 		this.player.getUnlockedForgingBlueprints().add(forgeId);
+		this.player.sendPacket(new PacketForgeFormulaDataNotify(forgeId));
 
-		// Done.
 		return true;
 	}
 

src/main/java/emu/grasscutter/game/managers/InventoryManager.java

@@ -822,6 +822,7 @@ public class InventoryManager {
 		}
 		
 		int used = 0;
+		boolean useSuccess = false;
 		
 		// Use
 		switch (useItem.getItemData().getMaterialType()) {
@@ -853,12 +854,7 @@ public class InventoryManager {
 				// Handle forging blueprints.
 				if (useItem.getItemData().getItemUse().get(0).getUseOp().equals("ITEM_USE_UNLOCK_FORGE")) {
 					// Unlock.
-					boolean success = player.getForgingManager().unlockForgingBlueprint(useItem);
-
-					// Use up the blueprint item if successful.
-					if (success) {
-						used = 1;
-					}
+					useSuccess = player.getForgingManager().unlockForgingBlueprint(useItem);
 				}
 				break;
 			case MATERIAL_CHEST:
@@ -925,10 +921,15 @@ public class InventoryManager {
 			used = 1;
 		}
 
+		// If we used at least one item, or one of the methods called here reports using the item successfully,
+		// we return the item to make UseItemRsp a success.
 		if (used > 0) {
 			player.getInventory().removeItem(useItem, used);
 			return useItem;
 		}
+		if (useSuccess) {
+			return useItem;
+		}
 
 		return null;
 	}