Paper/nms-patches/BlockFenceGate.patch

--- a/net/minecraft/server/BlockFenceGate.java
+++ b/net/minecraft/server/BlockFenceGate.java
@@ -103,6 +103,17 @@
     public void doPhysics(IBlockData iblockdata, World world, BlockPosition blockposition, Block block, BlockPosition blockposition1, boolean flag) {
         if (!world.isClientSide) {
             boolean flag1 = world.isBlockIndirectlyPowered(blockposition);
+            // CraftBukkit start
+            boolean oldPowered = iblockdata.get(BlockFenceGate.POWERED);
+            if (oldPowered != flag1) {
+                int newPower = flag1 ? 15 : 0;
+                int oldPower = oldPowered ? 15 : 0;
+                org.bukkit.block.Block bukkitBlock = org.bukkit.craftbukkit.block.CraftBlock.at(world, blockposition);
+                org.bukkit.event.block.BlockRedstoneEvent eventRedstone = new org.bukkit.event.block.BlockRedstoneEvent(bukkitBlock, oldPower, newPower);
+                world.getServer().getPluginManager().callEvent(eventRedstone);
+                flag1 = eventRedstone.getNewCurrent() > 0;
+            }
+            // CraftBukkit end
 
             if ((Boolean) iblockdata.get(BlockFenceGate.POWERED) != flag1) {
                 world.setTypeAndData(blockposition, (IBlockData) ((IBlockData) iblockdata.set(BlockFenceGate.POWERED, flag1)).set(BlockFenceGate.OPEN, flag1), 2);