[ChunkDataThrottle] Add enhancedAntiXray option

Author: Rothes

bukkit/src/main/kotlin/io/github/rothes/esu/bukkit/module/NetworkThrottleModule.kt

@@ -207,7 +207,12 @@ object NetworkThrottleModule: BukkitModule<NetworkThrottleModule.ModuleConfig, N
                     }
                 }.toMutableList())
                 put("world_the_end", mutableListOf(Material.END_STONE))
-            }
+            },
+            @Comment("""
+                If enabled, we add a extra block type to chunk section palettes for the random block.
+                This will greatly enhance anti-xray capabilities while giving only few bytes of additional bandwidth.
+            """)
+            val enhancedAntiXray: Boolean = true,
         ) {
 
             @RemovedNode

bukkit/version/v1_18/src/main/kotlin/io/github/rothes/esu/bukkit/module/networkthrottle/chunkdatathrottle/v1_18/ChunkDataThrottleHandlerImpl.kt

@@ -440,11 +440,12 @@ class ChunkDataThrottleHandlerImpl: ChunkDataThrottleHandler,
                             bits = (32 - (frequency.size - empty - 1).countLeadingZeroBits())
                                 .coerceAtLeast(4) // Vanilla forces at least 4
                             val remapped =
-                                if (frequency.size - empty - 1 and (1 shl bits - 1) ==
-                                    frequency.size - empty     and (1 shl bits - 1) ||
-                                    frequency.size - empty + 1 <= (1 shl 4)
+                                if (config.enhancedAntiXray && (
+                                       // Check if we can add a block type without adding bits used.
+                                       frequency.size - empty - 1 and (1 shl bits - 1) ==
+                                       frequency.size - empty     and (1 shl bits - 1) ||
+                                       frequency.size - empty + 1 <= (1 shl 4))
                                     ) {
-                                    // If we can add a block type without adding bits used, we add one random block.
                                     for ((i, v) in remappedState.withIndex()) {
                                         remappedState[i] = v + 1
                                     }