Undo/redo should not be allowed outside allowed regions by default.

Fixes #949

worldedit-core/src/main/java/com/fastasyncworldedit/core/configuration/Settings.java

@@ -167,6 +167,11 @@ public class Settings extends Config {
                 "Should large edits require confirmation (>16384 chunks)",
         })
         public boolean CONFIRM_LARGE = true;
+        @Comment({
+            "If undo and redo commands should be restricted to allowed regions",
+            " - Prevents scenarios where players can delete/reset a region, and then continue to undo/redo on it"
+        })
+        public boolean RESTRICT_HISTORY_TO_REGIONS = true;
         @Comment({
                 "List of blocks to strip nbt from",
         })
@@ -523,6 +528,7 @@ public class Settings extends Config {
                 limit.SPEED_REDUCTION = Math.min(limit.SPEED_REDUCTION, newLimit.SPEED_REDUCTION);
                 limit.FAST_PLACEMENT |= newLimit.FAST_PLACEMENT;
                 limit.CONFIRM_LARGE &= newLimit.CONFIRM_LARGE;
+                limit.RESTRICT_HISTORY_TO_REGIONS &= newLimit.RESTRICT_HISTORY_TO_REGIONS;
                 if (limit.STRIP_NBT == null) {
                     limit.STRIP_NBT = newLimit.STRIP_NBT.isEmpty() ? Collections.emptySet() : new HashSet<>(newLimit.STRIP_NBT);
                 } else if (limit.STRIP_NBT.isEmpty() || newLimit.STRIP_NBT.isEmpty()) {

worldedit-core/src/main/java/com/fastasyncworldedit/core/object/FaweLimit.java

@@ -18,6 +18,7 @@ public class FaweLimit {
     public int SPEED_REDUCTION = Integer.MAX_VALUE;
     public boolean FAST_PLACEMENT = false;
     public boolean CONFIRM_LARGE = true;
+    public boolean RESTRICT_HISTORY_TO_REGIONS = true;
     public Set<String> STRIP_NBT = null;
 
     public static FaweLimit MAX;
@@ -108,6 +109,7 @@ public class FaweLimit {
         MAX.MAX_EXPRESSION_MS = 50;
         MAX.FAST_PLACEMENT = true;
         MAX.CONFIRM_LARGE = true;
+        MAX.RESTRICT_HISTORY_TO_REGIONS = false;
         MAX.STRIP_NBT = null;
     }
 
@@ -229,6 +231,7 @@ public class FaweLimit {
             && INVENTORY_MODE == 0
             && SPEED_REDUCTION == 0
             && FAST_PLACEMENT
+            && !RESTRICT_HISTORY_TO_REGIONS
             && (STRIP_NBT == null || STRIP_NBT.isEmpty());
     }
 
@@ -245,6 +248,7 @@ public class FaweLimit {
         SPEED_REDUCTION = limit.SPEED_REDUCTION;
         FAST_PLACEMENT = limit.FAST_PLACEMENT;
         CONFIRM_LARGE = limit.CONFIRM_LARGE;
+        RESTRICT_HISTORY_TO_REGIONS = limit.RESTRICT_HISTORY_TO_REGIONS;
         STRIP_NBT = limit.STRIP_NBT;
     }
 
@@ -262,6 +266,7 @@ public class FaweLimit {
         limit.MAX_HISTORY = MAX_HISTORY;
         limit.FAST_PLACEMENT = FAST_PLACEMENT;
         limit.CONFIRM_LARGE = CONFIRM_LARGE;
+        limit.RESTRICT_HISTORY_TO_REGIONS = RESTRICT_HISTORY_TO_REGIONS;
         limit.STRIP_NBT = STRIP_NBT;
         return limit;
     }

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

@@ -566,15 +566,17 @@ public class LocalSession implements TextureHolder {
         loadSessionHistoryFromDisk(actor.getUniqueId(), world);
         if (getHistoryNegativeIndex() < history.size()) {
             ChangeSet changeSet = getChangeSet(history.get(getHistoryIndex()));
-            try (EditSession newEditSession = new EditSessionBuilder(world)
+            EditSessionBuilder builder = new EditSessionBuilder(world)
-                    .allowedRegionsEverywhere()
                 .checkMemory(false)
                 .changeSetNull()
                 .fastmode(false)
                 .limitUnprocessed((Player)actor)
                 .player((Player)actor)
-                    .blockBag(getBlockBag((Player)actor))
+                .blockBag(getBlockBag((Player)actor));
-                    .build()) {
+            if (!actor.getLimit().RESTRICT_HISTORY_TO_REGIONS) {
+                builder.allowedRegionsEverywhere();
+            }
+            try (EditSession newEditSession = builder.build()) {
                 newEditSession.setBlocks(changeSet, ChangeSetExecutor.Type.UNDO);
                 setDirty();
                 historyNegativeIndex++;