Fix PR notes

worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -134,7 +134,6 @@
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.Random;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;

worldedit-core/src/main/java/com/sk89q/worldedit/command/BrushCommands.java

@@ -203,6 +203,7 @@ public void splatterBrush(Player player, LocalSession session,
         tool.setBrush(new SplatterBrush(decay), "worldedit.brush.splatter");
 
         player.printInfo(TranslatableComponent.of("worldedit.brush.splatter.equip", TextComponent.of((int) radius), TextComponent.of(decay)));
+        ToolCommands.sendUnbindInstruction(player, UNBIND_COMMAND_COMPONENT);
     }
 
 

worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/SplatterMask.java

@@ -30,6 +30,7 @@ public class SplatterMask extends AbstractMask {
 
     private final BlockVector3 position;
     private final double decay;
+    private final double size;
     private final double sizeSq;
 
     public SplatterMask(BlockVector3 position, double decay, double size) {
@@ -38,6 +39,7 @@ public SplatterMask(BlockVector3 position, double decay, double size) {
 
         this.position = position;
         this.decay = decay;
+        this.size = size;
         this.sizeSq = size * size;
     }
 
@@ -54,6 +56,6 @@ public boolean test(BlockVector3 vector) {
     @Nullable
     @Override
     public Mask2D toMask2D() {
-        return null;
+        return new SplatterMask2D(position.toBlockVector2(), decay, size);
     }
 }

worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/SplatterMask2D.java

@@ -0,0 +1,52 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.function.mask;
+
+import com.sk89q.worldedit.math.BlockVector2;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+public class SplatterMask2D extends AbstractMask2D {
+
+    private final BlockVector2 position;
+    private final double decay;
+    private final double sizeSq;
+
+    public SplatterMask2D(BlockVector2 position, double decay, double size) {
+        checkArgument(decay >= 0, "decay must be >= 0");
+        checkArgument(decay <= 1, "decay must be <= 1");
+
+        this.position = position;
+        this.decay = decay;
+        this.sizeSq = size * size;
+    }
+
+    @Override
+    public boolean test(BlockVector2 vector) {
+        double distSq = vector.distanceSq(position);
+        double distRatio = distSq / sizeSq;
+
+        double decayChance = distRatio * decay * 2;
+
+        return ThreadLocalRandom.current().nextDouble() > decayChance;
+    }
+}