Scattercommand should use the same editsession for all commands, make it "silent" by default and allow players to see output if wanted.

worldedit-core/src/main/java/com/fastasyncworldedit/core/command/tool/brush/ScatterCommand.java

@@ -11,20 +11,29 @@ import com.sk89q.worldedit.extension.platform.PlatformCommandManager;
 import com.sk89q.worldedit.function.pattern.Pattern;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.regions.selector.CuboidRegionSelector;
+import com.sk89q.worldedit.util.formatting.text.Component;
 
 import java.util.List;
 
 public class ScatterCommand extends ScatterBrush {
 
     private final String command;
+    private final boolean print;
 
-    public ScatterCommand(int count, int distance, String command) {
+    public ScatterCommand(int count, int distance, String command, boolean print) {
         super(count, distance);
         this.command = command;
+        this.print = print;
     }
 
     @Override
-    public void apply(EditSession editSession, LocalBlockVectorSet placed, BlockVector3 position, Pattern p, double size) throws
+    public void apply(
+            EditSession editSession,
+            LocalBlockVectorSet placed,
+            BlockVector3 position,
+            Pattern pattern,
+            double size
+    ) throws
             MaxChangedBlocksException {
         int radius = getDistance();
         CuboidRegionSelector selector = new CuboidRegionSelector(
@@ -42,12 +51,40 @@ public class ScatterCommand extends ScatterBrush {
         player.setSelection(selector);
         List<String> cmds = StringMan.split(replaced, ';');
         for (String cmd : cmds) {
-            CommandEvent event = new CommandEvent(
-                    new LocationMaskedPlayerWrapper(player, player.getLocation().setPosition(position.toVector3()), false),
-                    cmd
-            );
+            Player p = print ?
+                    new LocationMaskedPlayerWrapper(player, player.getLocation().setPosition(position.toVector3()), false) :
+                    new ScatterCommandPlayerWrapper(player, position);
+            CommandEvent event = new CommandEvent(p, cmd, editSession);
             PlatformCommandManager.getInstance().handleCommandOnCurrentThread(event);
         }
     }
 
+    private static final class ScatterCommandPlayerWrapper extends LocationMaskedPlayerWrapper {
+
+        ScatterCommandPlayerWrapper(Player player, BlockVector3 position) {
+            super(player, player.getLocation().setPosition(position.toVector3()), false);
+        }
+
+        @Override
+        public void print(String msg) {
+        }
+
+        @Override
+        public void print(Component component) {
+        }
+
+        @Override
+        public void printDebug(String msg) {
+        }
+
+        @Override
+        public void printError(String msg) {
+        }
+
+        @Override
+        public void printRaw(String msg) {
+        }
+
+    }
+
 }

worldedit-core/src/main/java/com/fastasyncworldedit/core/wrappers/SilentPlayerWrapper.java

@@ -21,7 +21,6 @@ public class SilentPlayerWrapper extends AsyncPlayer {
 
     @Override
     public void print(Component component) {
-        super.print(component);
     }
 
     @Override

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

@@ -694,13 +694,15 @@ public class BrushCommands {
             @Arg(desc = "double", def = "1")
                     double distance,
             @Arg(desc = "List of comma-separated commands")
-                    List<String> commandStr
+                    List<String> commandStr,
+            @Switch(name = 'p', desc = "Show any printed output")
+                    boolean print
     )
             throws WorldEditException {
         worldEdit.checkMaxBrushRadius(radius);
         set(
                 context,
-                new ScatterCommand((int) points, (int) distance, StringMan.join(commandStr, " ")),
+                new ScatterCommand((int) points, (int) distance, StringMan.join(commandStr, " "), print),
                 "worldedit.brush.scattercommand"
         )
                 .setSize(radius);

worldedit-core/src/main/java/com/sk89q/worldedit/event/platform/CommandEvent.java

@@ -19,10 +19,13 @@
 
 package com.sk89q.worldedit.event.platform;
 
+import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.event.AbstractCancellable;
 import com.sk89q.worldedit.extension.platform.Actor;
 import com.sk89q.worldedit.extension.platform.PlatformCommandManager;
 
+import javax.annotation.Nullable;
+
 import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
@@ -32,6 +35,10 @@ public class CommandEvent extends AbstractCancellable {
 
     private final Actor actor;
     private final String arguments;
+    //FAWE start
+    @Nullable
+    private final EditSession session;
+    //FAWE end
 
     /**
      * Create a new instance.
@@ -45,8 +52,32 @@ public class CommandEvent extends AbstractCancellable {
 
         this.actor = actor;
         this.arguments = arguments;
+        //FAWE start
+        this.session = null;
     }
 
+    /**
+     * Create a new instance.
+     *
+     * @param actor       the player
+     * @param arguments   the arguments
+     * @param editSession the editsession
+     */
+    public CommandEvent(Actor actor, String arguments, @Nullable EditSession editSession) {
+        checkNotNull(actor);
+        checkNotNull(arguments);
+
+        this.actor = actor;
+        this.arguments = arguments;
+        this.session = editSession;
+    }
+
+    @Nullable
+    public EditSession getSession() {
+        return session;
+    }
+    //FAWE end
+
     /**
      * Get the actor that issued the command.
      *

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/PlatformCommandManager.java

@@ -795,7 +795,8 @@ public final class PlatformCommandManager {
             }
             Optional<EditSession> editSessionOpt = context.injectedValue(Key.of(EditSession.class));
 
-            if (editSessionOpt.isPresent()) {
+            // Require null CommandEvent#getSession as it means the editsession is being handled somewhere else.
+            if (editSessionOpt.isPresent() && event.getSession() == null) {
                 EditSession editSession = editSessionOpt.get();
                 editSession.flushQueue();
                 session.remember(editSession);
@@ -866,6 +867,14 @@ public final class PlatformCommandManager {
         store.injectValue(Key.of(boolean.class), context -> Optional.of(isSuggestions));
         store.injectValue(Key.of(InjectedValueStore.class), ValueProvider.constant(store));
         store.injectValue(Key.of(Event.class), ValueProvider.constant(event));
+        //FAWE start - allow giving editsessions
+        if (event instanceof CommandEvent) {
+            EditSession session = ((CommandEvent) event).getSession();
+            if (session != null) {
+                store.injectValue(Key.of(EditSession.class), context -> Optional.of(session));
+            }
+        }
+        //FAWE end
         return MemoizingValueAccess.wrap(
                 MergedValueAccess.of(store, globalInjectedValues)
         );