Properly wait for queue to flush

- Ensuring the queue is flushed may wait slightly longer than necessary

core/src/main/java/com/boydti/fawe/config/BBC.java

@@ -63,7 +63,7 @@ public enum BBC {
     COMMAND_UNDO_FAIL("Nothing left to undo.", "WorldEdit.History"),
     COMMAND_UNDO_SUCCESS("Undo successful.", "WorldEdit.History"),
 
-    OPERATION("Operation complete (%s0)", "WorldEdit.Operation"),
+    OPERATION("Operation queued (%s0)", "WorldEdit.Operation"),
 
     SELECTION_WAND("Left click: select pos #1; Right click: select pos #2", "WorldEdit.Selection"),
     SELECTION_WAND_DISABLE("Edit wand disabled.", "WorldEdit.Selection"),

core/src/main/java/com/boydti/fawe/object/exception/FaweException.java

@@ -3,15 +3,15 @@ package com.boydti.fawe.object.exception;
 import com.boydti.fawe.config.BBC;
 
 public class FaweException extends RuntimeException {
-    private final String message;
+    private final BBC message;
 
     public FaweException(BBC reason) {
-        this.message = reason.format();
+        this.message = reason;
     }
 
     @Override
     public String getMessage() {
-        return message;
+        return message == null ? null : message.format();
     }
 
     public static FaweException get(Throwable e) {
@@ -30,4 +30,9 @@ public class FaweException extends RuntimeException {
             super(BBC.WORLDEDIT_FAILED_LOAD_CHUNK);
         }
     }
+
+    @Override
+    public Throwable fillInStackTrace() {
+        return this;
+    }
 }

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

@@ -1103,14 +1103,12 @@ public class EditSession implements Extent {
             queue.dequeue();
             return;
         }
+        if (Fawe.get().isMainThread()) {
+            SetQueue.IMP.flush(queue);
+        } else {
+            queue.flush();
+        }
         if (getChangeSet() != null) {
-            if (Settings.HISTORY.COMBINE_STAGES && queue.size() > 0) {
-                if (Fawe.get().isMainThread()) {
-                    SetQueue.IMP.flush(queue);
-                } else {
-                    queue.flush();
-                }
-            }
             ((FaweChangeSet) getChangeSet()).flush();
         }
     }