Paper/patches/server/0746-Fix-tripwire-state-inconsistency.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <nassim@njahnke.dev>
Date: Sun, 19 Dec 2021 21:11:20 +0100
Subject: [PATCH] Fix tripwire state inconsistency

This patch prevents updating and re-setting the tripwire when being removed in certain conditions

diff --git a/src/main/java/net/minecraft/world/level/block/TripWireBlock.java b/src/main/java/net/minecraft/world/level/block/TripWireBlock.java
index 4e2fb4ee8e46b3c363992ff23e26f5a648c5f003..7f60175bf671d282c11e9084670d2bb900968255 100644
--- a/src/main/java/net/minecraft/world/level/block/TripWireBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/TripWireBlock.java
@@ -74,7 +74,7 @@ public class TripWireBlock extends Block {
     @Override
     public void onRemove(BlockState state, Level world, BlockPos pos, BlockState newState, boolean moved) {
         if (!moved && !state.is(newState.getBlock())) {
-            this.updateSource(world, pos, (BlockState) state.setValue(TripWireBlock.POWERED, true));
+            this.updateSource(world, pos, (BlockState) state.setValue(TripWireBlock.POWERED, true), true); // Paper - fix state inconsistency
         }
     }
 
@@ -89,6 +89,12 @@ public class TripWireBlock extends Block {
     }
 
     private void updateSource(Level world, BlockPos pos, BlockState state) {
+        // Paper start - fix state inconsistency
+        this.updateSource(world, pos, state, false);
+    }
+
+    private void updateSource(Level world, BlockPos pos, BlockState state, boolean beingRemoved) {
+        // Paper end
         Direction[] aenumdirection = new Direction[]{Direction.SOUTH, Direction.WEST};
         int i = aenumdirection.length;
         int j = 0;
@@ -104,7 +110,7 @@ public class TripWireBlock extends Block {
 
                     if (iblockdata1.is((Block) this.hook)) {
                         if (iblockdata1.getValue(TripWireHookBlock.FACING) == enumdirection.getOpposite()) {
-                            this.hook.calculateState(world, blockposition1, iblockdata1, false, true, k, state);
+                            this.hook.calculateState(world, blockposition1, iblockdata1, false, true, k, state, beingRemoved); // Paper - fix state inconsistency
                         }
                     } else if (iblockdata1.is((Block) this)) {
                         ++k;
diff --git a/src/main/java/net/minecraft/world/level/block/TripWireHookBlock.java b/src/main/java/net/minecraft/world/level/block/TripWireHookBlock.java
index 4a516828e5c6abd63511ee7c93fcff11203cf8d0..004dce26ff073f1de52a84cd425c4f60fdab5e50 100644
--- a/src/main/java/net/minecraft/world/level/block/TripWireHookBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/TripWireHookBlock.java
@@ -108,6 +108,12 @@ public class TripWireHookBlock extends Block {
     }
 
     public void calculateState(Level world, BlockPos pos, BlockState state, boolean beingRemoved, boolean flag1, int i, @Nullable BlockState iblockdata1) {
+        // Paper start - fix tripwire inconsistency
+        this.calculateState(world, pos, state, beingRemoved, flag1, i, iblockdata1, false);
+    }
+
+    public void calculateState(Level world, BlockPos pos, BlockState state, boolean beingRemoved, boolean flag1, int i, @Nullable BlockState iblockdata1, boolean tripWireBeingRemoved) {
+        // Paper end
         Direction enumdirection = (Direction) state.getValue(TripWireHookBlock.FACING);
         boolean flag2 = (Boolean) state.getValue(TripWireHookBlock.ATTACHED);
         boolean flag3 = (Boolean) state.getValue(TripWireHookBlock.POWERED);
@@ -141,6 +147,7 @@ public class TripWireHookBlock extends Block {
                 boolean flag7 = (Boolean) iblockdata2.getValue(TripWireBlock.POWERED);
 
                 flag5 |= flag6 && flag7;
+                if (k != i || !tripWireBeingRemoved || !flag6) // Paper - don't update the tripwire again if being removed and not disarmed
                 aiblockdata[k] = iblockdata2;
                 if (k == i) {
                     world.scheduleTick(pos, (Block) this, 10);