Ignore movement packets from dead players.

As funny as the idea sounds of having corpses sliding around it
shouldn't really be allowed. Due to other checks added by CB
previously this was mostly harmless anyway.

By: Thinkofname <thinkofdeath@spigotmc.org>

paper-server/nms-patches/PlayerConnection.patch

@@ -273,6 +273,15 @@
                  this.minecraftServer.getPlayerList().d(this.player);
                  this.player.checkMovement(this.player.locX - d0, this.player.locY - d1, this.player.locZ - d2);
                  this.D = d11 >= -0.03125D && !this.minecraftServer.getAllowFlight() && !worldserver.d(entity.getBoundingBox().g(0.0625D).a(0.0D, -0.55D, 0.0D));
+@@ -263,7 +441,7 @@
+         } else {
+             WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
+ 
+-            if (!this.player.viewingCredits) {
++            if (!this.player.viewingCredits && !this.player.dead) { // CraftBukkit - Added ' && !this.player.dead'
+                 if (this.e == 0) {
+                     this.d();
+                 }
 @@ -273,13 +451,21 @@
                          this.A = this.e;
                          this.a(this.teleportPos.x, this.teleportPos.y, this.teleportPos.z, this.player.yaw, this.player.pitch);
@@ -1460,7 +1469,15 @@
                  if (ItemStack.matches(packetplayinwindowclick.e(), itemstack)) {
                      this.player.playerConnection.sendPacket(new PacketPlayOutTransaction(packetplayinwindowclick.a(), packetplayinwindowclick.d(), true));
                      this.player.f = true;
-@@ -915,8 +1914,48 @@
+@@ -881,6 +1880,7 @@
+ 
+     public void a(PacketPlayInEnchantItem packetplayinenchantitem) {
+         PlayerConnectionUtils.ensureMainThread(packetplayinenchantitem, this, this.player.x());
++        if (this.player.dead) return; // CraftBukkit
+         this.player.resetIdleTimer();
+         if (this.player.activeContainer.windowId == packetplayinenchantitem.a() && this.player.activeContainer.c(this.player) && !this.player.isSpectator()) {
+             this.player.activeContainer.a(this.player, packetplayinenchantitem.b());
+@@ -915,8 +1915,48 @@
              }
  
              boolean flag1 = packetplayinsetcreativeslot.a() >= 1 && packetplayinsetcreativeslot.a() <= 45;
@@ -1510,7 +1527,7 @@
  
              if (flag1 && flag2 && flag3) {
                  if (itemstack == null) {
-@@ -940,6 +1979,7 @@
+@@ -940,6 +1980,7 @@
  
      public void a(PacketPlayInTransaction packetplayintransaction) {
          PlayerConnectionUtils.ensureMainThread(packetplayintransaction, this, this.player.x());
@@ -1518,7 +1535,7 @@
          Short oshort = (Short) this.k.get(this.player.activeContainer.windowId);
  
          if (oshort != null && packetplayintransaction.b() == oshort.shortValue() && this.player.activeContainer.windowId == packetplayintransaction.a() && !this.player.activeContainer.c(this.player) && !this.player.isSpectator()) {
-@@ -950,6 +1990,7 @@
+@@ -950,6 +1991,7 @@
  
      public void a(PacketPlayInUpdateSign packetplayinupdatesign) {
          PlayerConnectionUtils.ensureMainThread(packetplayinupdatesign, this, this.player.x());
@@ -1526,7 +1543,7 @@
          this.player.resetIdleTimer();
          WorldServer worldserver = this.minecraftServer.getWorldServer(this.player.dimension);
          BlockPosition blockposition = packetplayinupdatesign.a();
-@@ -966,14 +2007,30 @@
+@@ -966,14 +2008,30 @@
  
              if (!tileentitysign.b() || tileentitysign.c() != this.player) {
                  this.minecraftServer.warning("Player " + this.player.getName() + " just tried to change non-editable sign");
@@ -1558,7 +1575,7 @@
  
              tileentitysign.update();
              worldserver.notify(blockposition, iblockdata, iblockdata, 3);
-@@ -996,11 +2053,27 @@
+@@ -996,11 +2054,27 @@
  
      public void a(PacketPlayInAbilities packetplayinabilities) {
          PlayerConnectionUtils.ensureMainThread(packetplayinabilities, this, this.player.x());
@@ -1587,7 +1604,7 @@
          ArrayList arraylist = Lists.newArrayList();
          Iterator iterator = this.minecraftServer.tabCompleteCommand(this.player, packetplayintabcomplete.a(), packetplayintabcomplete.b(), packetplayintabcomplete.c()).iterator();
  
-@@ -1334,12 +2407,34 @@
+@@ -1334,12 +2408,34 @@
                              packetdataserializer.release();
                          }
                      }