Don't merge player movements (fixes block breaking issues)

Fixes #1640

Spigot-Server-Patches/0402-MC-136865-Use-valid-item-for-enchantment-checks-on-b.patch

@@ -1,4 +1,4 @@
-From 1e51c493238f91608639b9fb04b67737ff5b93e5 Mon Sep 17 00:00:00 2001
+From a101ae9254d474be1b9817bb5970ca62414fcdcc Mon Sep 17 00:00:00 2001
 From: MisterVector <whizkid3000@hotmail.com>
 Date: Thu, 1 Nov 2018 14:50:05 -0700
 Subject: [PATCH] MC-136865: Use valid item for enchantment checks on block
@@ -13,24 +13,22 @@ keep the clone of the item used to a non empty value so it represents
 the item used.
 
 diff --git a/src/main/java/net/minecraft/server/PlayerInteractManager.java b/src/main/java/net/minecraft/server/PlayerInteractManager.java
-index 23fc4d8e14..dbbd1f3341 100644
+index 23fc4d8e14..599bdf054f 100644
 --- a/src/main/java/net/minecraft/server/PlayerInteractManager.java
 +++ b/src/main/java/net/minecraft/server/PlayerInteractManager.java
-@@ -378,8 +378,13 @@ public class PlayerInteractManager {
+@@ -375,10 +375,11 @@ public class PlayerInteractManager {
+                     ItemStack itemstack1 = this.player.getItemInMainHand();
+                     boolean flag1 = this.player.hasBlock(iblockdata);
+ 
++                    ItemStack itemstack2 = flag && flag1 && event.isDropItems() && !itemstack1.isEmpty() ? itemstack1.cloneItemStack() : null; // Paper - MC-136865 - clone before use
                      itemstack1.a(this.world, iblockdata, blockposition, this.player);
                      // CraftBukkit start - Check if block should drop items
                      if (flag && flag1 && event.isDropItems()) {
 -                        ItemStack itemstack2 = itemstack1.isEmpty() ? ItemStack.a : itemstack1.cloneItemStack();
-+                        // Paper start - fixes MC-136865
-+                        ItemStack itemstack2 = itemstack1.cloneItemStack(true);
++                        //ItemStack itemstack2 = itemstack1.isEmpty() ? ItemStack.a : itemstack1.cloneItemStack(); // Paper - MC-136865 - move up
  
-+                        if (itemstack2.isEmpty()) {
-+                            itemstack2.add(1);
-+                        }
-+                        // Paper end
                          iblockdata.getBlock().a(this.world, this.player, blockposition, iblockdata, tileentity, itemstack2);
                      }
-                     // CraftBukkit end
 -- 
 2.19.1
 

Spigot-Server-Patches/0403-Optimize-Small-Entity-Movement.patch

@@ -1,4 +1,4 @@
-From ce3b80309494df7c3a3f9c288d3cfe5d07fd8fb3 Mon Sep 17 00:00:00 2001
+From 57dd32ddf7eb78cbf184e12490e15445dc960f91 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Thu, 1 Nov 2018 19:45:51 -0400
 Subject: [PATCH] Optimize Small Entity Movement
@@ -130,6 +130,25 @@ index 86488e9709..e6348a2931 100644
      protected void initAttributes() {
          super.initAttributes();
          this.getAttributeMap().b(GenericAttributes.e);
+diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
+index 4490b63258..aa5b58066a 100644
+--- a/src/main/java/net/minecraft/server/EntityPlayer.java
++++ b/src/main/java/net/minecraft/server/EntityPlayer.java
+@@ -1643,6 +1643,14 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
+         this.keepLevel = false;
+     }
+ 
++    // Paper start
++    @Override
++    public boolean shouldMergeMovement(double mergeMin, double d0, double d1, double d2) {
++        // We need precise movement for players
++        return false;
++    }
++    // Paper end
++
+     @Override
+     public CraftPlayer getBukkitEntity() {
+         return (CraftPlayer) super.getBukkitEntity();
 diff --git a/src/main/java/net/minecraft/server/EntitySlime.java b/src/main/java/net/minecraft/server/EntitySlime.java
 index e63f4afa9b..f1266c0ce1 100644
 --- a/src/main/java/net/minecraft/server/EntitySlime.java