SPIGOT-954: Don't send block animations or gamemode updates to players can't see the player

By: Thinkofdeath <thinkofdeath@spigotmc.org>

paper-server/nms-patches/WorldManager.patch

@@ -26,3 +26,29 @@
      }
  
      public void a(int i, BlockPosition blockposition, int j) {
+@@ -52,6 +55,12 @@
+     public void b(int i, BlockPosition blockposition, int j) {
+         Iterator iterator = this.a.getPlayerList().v().iterator();
+ 
++        // CraftBukkit start
++        EntityHuman entityhuman = null;
++        Entity entity = world.a(i); // PAIL Rename getEntity
++        if (entity instanceof EntityHuman) entityhuman = (EntityHuman) entity;
++        // CraftBukkit end
++
+         while (iterator.hasNext()) {
+             EntityPlayer entityplayer = (EntityPlayer) iterator.next();
+ 
+@@ -60,6 +69,12 @@
+                 double d1 = (double) blockposition.getY() - entityplayer.locY;
+                 double d2 = (double) blockposition.getZ() - entityplayer.locZ;
+ 
++                // CraftBukkit start
++                if (entityhuman != null && entityhuman instanceof EntityPlayer && !entityplayer.getBukkitEntity().canSee(((EntityPlayer) entityhuman).getBukkitEntity())) {
++                    continue;
++                }
++                // CraftBukkit end
++
+                 if (d0 * d0 + d1 * d1 + d2 * d2 < 1024.0D) {
+                     entityplayer.playerConnection.sendPacket(new PacketPlayOutBlockBreakAnimation(i, blockposition, j));
+                 }