player selects hotbar slot, fixes #557

src/main/java/carpet/helpers/EntityPlayerActionPack.java

@@ -10,6 +10,7 @@ import net.minecraft.entity.player.PlayerInventory;
 import net.minecraft.entity.vehicle.BoatEntity;
 import net.minecraft.entity.vehicle.MinecartEntity;
 import net.minecraft.item.ItemStack;
+import net.minecraft.network.packet.s2c.play.HeldItemChangeS2CPacket;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.network.packet.c2s.play.PlayerActionC2SPacket;
 import net.minecraft.server.world.ServerWorld;
@@ -276,6 +277,12 @@ public class EntityPlayerActionPack
         }
     }
 
+    public void setSlot(int slot)
+    {
+        player.inventory.selectedSlot = slot-1;
+        player.networkHandler.sendPacket(new HeldItemChangeS2CPacket(slot-1));
+    }
+
     public enum ActionType
     {
         USE(true)