Cancel serverbound stab packets (ViaVersion#4744)

Author: booky10

common/src/main/java/com/viaversion/viaversion/protocols/v1_21_9to1_21_11/rewriter/EntityPacketRewriter1_21_11.java

@@ -21,6 +21,8 @@
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_21_11;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
 import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_21_11;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_21_5to1_21_6.packet.ServerboundPackets1_21_6;
 import com.viaversion.viaversion.protocols.v1_21_7to1_21_9.packet.ClientboundPacket1_21_9;
 import com.viaversion.viaversion.protocols.v1_21_7to1_21_9.packet.ClientboundPackets1_21_9;
 import com.viaversion.viaversion.protocols.v1_21_9to1_21_11.Protocol1_21_9To1_21_11;
@@ -45,6 +47,14 @@ public void registerPackets() {
         registerLogin1_20_5(ClientboundPackets1_21_9.LOGIN);
         registerRespawn1_20_5(ClientboundPackets1_21_9.RESPAWN);
 
+        protocol.registerServerbound(ServerboundPackets1_21_6.PLAYER_ACTION, wrapper -> {
+            final int action = wrapper.passthrough(Types.VAR_INT);
+            // cancel spear "stab" packets sent by the client
+            if (action == 7) {
+                wrapper.cancel();
+            }
+        });
+
         protocol.registerClientbound(ClientboundPackets1_21_9.HORSE_SCREEN_OPEN, ClientboundPackets1_21_11.MOUNT_SCREEN_OPEN);
     }