Fix things using wall time running too fast. Fixes BUKKIT-4155

When converting things in Minecraft to use wall time instead of ticks I
realized we'd run into integer division rounding issues and could have
updates that end up counting as zero ticks. To compensate for this the
code ensures we always process at least one tick. However, every time we
end up with zero ticks the next time we have an extra tick due to rounding
the other way with the leftovers. This means we are going far too fast and
should not have this at least one tick logic at all.

On top of this some potions rely on the number of ticks they run and not
just the amount of time they last and so potions were put back to running
with ticks entirely.

src/main/java/net/minecraft/server/EntityItem.java

@@ -56,7 +56,7 @@ public class EntityItem extends Entity {
     public void l_() {
         super.l_();
         // CraftBukkit start - Use wall time for pickup and despawn timers
-        int elapsedTicks = Math.max(1, MinecraftServer.currentTick - this.lastTick);
+        int elapsedTicks = MinecraftServer.currentTick - this.lastTick;
         this.pickupDelay -= elapsedTicks;
         this.age += elapsedTicks;
         this.lastTick = MinecraftServer.currentTick;

src/main/java/net/minecraft/server/EntityZombie.java

@@ -121,7 +121,7 @@ public class EntityZombie extends EntityMonster {
             int i = this.q();
 
             // CraftBukkit start - Use wall time instead of ticks for villager conversion
-            int elapsedTicks = Math.max(1, MinecraftServer.currentTick - this.lastTick);
+            int elapsedTicks = MinecraftServer.currentTick - this.lastTick;
             this.lastTick = MinecraftServer.currentTick;
             i *= elapsedTicks;
             // CraftBukkit end

src/main/java/net/minecraft/server/MobEffect.java

@@ -1,150 +0,0 @@
-package net.minecraft.server;
-
-public class MobEffect {
-
-    private int effectId;
-    private int duration;
-    private int amplification;
-    private boolean splash;
-    private boolean ambient;
-    private int lastTick = MinecraftServer.currentTick; // CraftBukkit
-
-    public MobEffect(int i, int j) {
-        this(i, j, 0);
-    }
-
-    public MobEffect(int i, int j, int k) {
-        this(i, j, k, false);
-    }
-
-    public MobEffect(int i, int j, int k, boolean flag) {
-        this.effectId = i;
-        this.duration = j;
-        this.amplification = k;
-        this.ambient = flag;
-    }
-
-    public MobEffect(MobEffect mobeffect) {
-        this.effectId = mobeffect.effectId;
-        this.duration = mobeffect.duration;
-        this.amplification = mobeffect.amplification;
-    }
-
-    public void a(MobEffect mobeffect) {
-        if (this.effectId != mobeffect.effectId) {
-            System.err.println("This method should only be called for matching effects!");
-        }
-
-        if (mobeffect.amplification > this.amplification) {
-            this.amplification = mobeffect.amplification;
-            this.duration = mobeffect.duration;
-        } else if (mobeffect.amplification == this.amplification && this.duration < mobeffect.duration) {
-            this.duration = mobeffect.duration;
-        } else if (!mobeffect.ambient && this.ambient) {
-            this.ambient = mobeffect.ambient;
-        }
-    }
-
-    public int getEffectId() {
-        return this.effectId;
-    }
-
-    public int getDuration() {
-        return this.duration;
-    }
-
-    public int getAmplifier() {
-        return this.amplification;
-    }
-
-    public boolean isSplash() {
-        return this.splash;
-    }
-
-    public void setSplash(boolean flag) {
-        this.splash = flag;
-    }
-
-    public boolean isAmbient() {
-        return this.ambient;
-    }
-
-    public boolean tick(EntityLiving entityliving) {
-        if (this.duration > 0) {
-            if (MobEffectList.byId[this.effectId].a(this.duration, this.amplification)) {
-                this.b(entityliving);
-            }
-
-            this.h();
-        }
-
-        return this.duration > 0;
-    }
-
-    private int h() {
-        // CraftBukkit start - Use wall time instead of ticks for potion effects
-        int elapsedTicks = Math.max(1, MinecraftServer.currentTick - this.lastTick);
-        this.lastTick = MinecraftServer.currentTick;
-        this.duration -= elapsedTicks;
-
-        return this.duration;
-        // CraftBukkit end
-    }
-
-    public void b(EntityLiving entityliving) {
-        if (this.duration > 0) {
-            MobEffectList.byId[this.effectId].tick(entityliving, this.amplification);
-        }
-    }
-
-    public String f() {
-        return MobEffectList.byId[this.effectId].a();
-    }
-
-    public int hashCode() {
-        return this.effectId;
-    }
-
-    public String toString() {
-        String s = "";
-
-        if (this.getAmplifier() > 0) {
-            s = this.f() + " x " + (this.getAmplifier() + 1) + ", Duration: " + this.getDuration();
-        } else {
-            s = this.f() + ", Duration: " + this.getDuration();
-        }
-
-        if (this.splash) {
-            s = s + ", Splash: true";
-        }
-
-        return MobEffectList.byId[this.effectId].i() ? "(" + s + ")" : s;
-    }
-
-    public boolean equals(Object object) {
-        if (!(object instanceof MobEffect)) {
-            return false;
-        } else {
-            MobEffect mobeffect = (MobEffect) object;
-
-            return this.effectId == mobeffect.effectId && this.amplification == mobeffect.amplification && this.duration == mobeffect.duration && this.splash == mobeffect.splash && this.ambient == mobeffect.ambient;
-        }
-    }
-
-    public NBTTagCompound a(NBTTagCompound nbttagcompound) {
-        nbttagcompound.setByte("Id", (byte) this.getEffectId());
-        nbttagcompound.setByte("Amplifier", (byte) this.getAmplifier());
-        nbttagcompound.setInt("Duration", this.getDuration());
-        nbttagcompound.setBoolean("Ambient", this.isAmbient());
-        return nbttagcompound;
-    }
-
-    public static MobEffect b(NBTTagCompound nbttagcompound) {
-        byte b0 = nbttagcompound.getByte("Id");
-        byte b1 = nbttagcompound.getByte("Amplifier");
-        int i = nbttagcompound.getInt("Duration");
-        boolean flag = nbttagcompound.getBoolean("Ambient");
-
-        return new MobEffect(b0, i, b1, flag);
-    }
-}

src/main/java/net/minecraft/server/TileEntityBrewingStand.java

@@ -64,7 +64,7 @@ public class TileEntityBrewingStand extends TileEntity implements IWorldInventor
 
     public void h() {
         // CraftBukkit start - Use wall time instead of ticks for brewing
-        int elapsedTicks = Math.max(1, MinecraftServer.currentTick - this.lastTick);
+        int elapsedTicks = MinecraftServer.currentTick - this.lastTick;
         this.lastTick = MinecraftServer.currentTick;
 
         if (this.brewTime > 0) {

src/main/java/net/minecraft/server/TileEntityFurnace.java

@@ -166,7 +166,7 @@ public class TileEntityFurnace extends TileEntity implements IWorldInventory {
         boolean flag1 = false;
 
         // CraftBukkit start - Use wall time instead of ticks for cooking
-        int elapsedTicks = Math.max(1, MinecraftServer.currentTick - this.lastTick);
+        int elapsedTicks = MinecraftServer.currentTick - this.lastTick;
         this.lastTick = MinecraftServer.currentTick;
 
         // CraftBukkit - moved from below