PaperMC/nms-patches/BlockDoor.patch

--- a/net/minecraft/server/BlockDoor.java
+++ b/net/minecraft/server/BlockDoor.java
@@ -2,6 +2,8 @@
 
 import javax.annotation.Nullable;
 
+import org.bukkit.event.block.BlockRedstoneEvent; // CraftBukkit
+
 public class BlockDoor extends Block {
 
     public static final BlockStateDirection FACING = BlockFacingHorizontal.FACING;
@@ -169,9 +171,24 @@
     }
 
     public void doPhysics(IBlockData iblockdata, World world, BlockPosition blockposition, Block block, BlockPosition blockposition1) {
-        boolean flag = world.isBlockIndirectlyPowered(blockposition) || world.isBlockIndirectlyPowered(blockposition.shift(iblockdata.get(BlockDoor.HALF) == BlockPropertyDoubleBlockHalf.LOWER ? EnumDirection.UP : EnumDirection.DOWN));
+        // CraftBukkit start
+        BlockPosition otherHalf = blockposition.shift(iblockdata.get(BlockDoor.HALF) == BlockPropertyDoubleBlockHalf.LOWER ? EnumDirection.UP : EnumDirection.DOWN);
+
+        org.bukkit.World bworld = world.getWorld();
+        org.bukkit.block.Block bukkitBlock = bworld.getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
+        org.bukkit.block.Block blockTop = bworld.getBlockAt(otherHalf.getX(), otherHalf.getY(), otherHalf.getZ());
+
+        int power = bukkitBlock.getBlockPower();
+        int powerTop = blockTop.getBlockPower();
+        if (powerTop > power) power = powerTop;
+        int oldPower = ((Boolean) iblockdata.get(BlockDoor.POWERED)).booleanValue() ? 15 : 0;
+
+        if (oldPower == 0 ^ power == 0) {
+            BlockRedstoneEvent eventRedstone = new BlockRedstoneEvent(bukkitBlock, oldPower, power);
+            world.getServer().getPluginManager().callEvent(eventRedstone);
 
-        if (block != this && flag != ((Boolean) iblockdata.get(BlockDoor.POWERED)).booleanValue()) {
+            boolean flag = eventRedstone.getNewCurrent() > 0;
+            // CraftBukkit end
             if (flag != ((Boolean) iblockdata.get(BlockDoor.OPEN)).booleanValue()) {
                 this.b(world, blockposition, flag);
             }