Add -e/-b/-m flags to //stack and //move, to match copy and paste.

Fixes WORLDEDIT-3935.

worldedit-core/src/main/java/com/sk89q/worldedit/regions/AbstractFlatRegion.java

@@ -0,0 +1,40 @@
+/*
+ * 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 Lesser 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 Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.regions;
+
+import com.sk89q.worldedit.world.World;
+
+public abstract class AbstractFlatRegion extends AbstractRegion implements FlatRegion {
+
+    protected AbstractFlatRegion(World world) {
+        super(world);
+    }
+
+    @Override
+    public int getMinimumY() {
+        return getMinimumPoint().getBlockY();
+    }
+
+    @Override
+    public int getMaximumY() {
+        return getMaximumPoint().getBlockY();
+    }
+
+}