fix: correctly trim the max chunk section (#2753)

- fixes #2727
- fixes IntellectualSites/Plotsquared#4436

worldedit-bukkit/src/main/java/com/fastasyncworldedit/bukkit/regions/plotsquared/PlotSquaredFeature.java

@@ -1,6 +1,5 @@
 package com.fastasyncworldedit.bukkit.regions.plotsquared;
 
-import com.fastasyncworldedit.core.FaweAPI;
 import com.fastasyncworldedit.core.configuration.Caption;
 import com.fastasyncworldedit.core.regions.FaweMask;
 import com.fastasyncworldedit.core.regions.FaweMaskManager;
@@ -174,22 +173,21 @@ public class PlotSquaredFeature extends FaweMaskManager {
             return null;
         }
 
-        Region maskedRegion;
-        if (regions.size() == 1) {
         final World world = player.getWorld();
         int min = area != null ? area.getMinBuildHeight() : world.getMinY();
         // PlotSquared uses exclusive max height, WorldEdit uses inclusive max height -> subtract 1
         int max = area != null ? Math.min(world.getMaxY(), area.getMaxBuildHeight() - 1) : world.getMaxY();
+        Region maskedRegion;
+        if (regions.size() == 1) {
 
             final CuboidRegion region = regions.iterator().next();
             final BlockVector3 pos1 = BlockVector3.at(region.getMinimumX(), min, region.getMinimumZ());
             final BlockVector3 pos2 = BlockVector3.at(region.getMaximumX(), max, region.getMaximumZ());
             maskedRegion = new CuboidRegion(pos1, pos2);
         } else {
-            World world = FaweAPI.getWorld(area.getWorldName());
             List<Region> weRegions = regions.stream().map(
-                    r -> new CuboidRegion(world, BlockVector3.at(r.getMinimumX(), r.getMinimumY(), r.getMinimumZ()),
-                            BlockVector3.at(r.getMaximumX(), r.getMaximumY(), r.getMaximumZ())
+                    r -> new CuboidRegion(world, BlockVector3.at(r.getMinimumX(), min, r.getMinimumZ()),
+                            BlockVector3.at(r.getMaximumX(), max, r.getMaximumZ())
                     )).collect(Collectors.toList());
             maskedRegion = new RegionIntersection(world, weRegions);
         }

worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/IBatchProcessor.java

@@ -58,7 +58,7 @@ public interface IBatchProcessor {
     /**
      * Utility method to trim a chunk based on min and max Y (inclusive).
      *
-     * @param keepInsideRange if all blocks inside the range (inclusive) should be kept (default)
+     * @param keepInsideRange if all blocks inside the range (inclusive) should be kept (default), or removed
      * @return false if chunk is empty of blocks
      */
     default boolean trimY(IChunkSet set, int minY, int maxY, final boolean keepInsideRange) {
@@ -74,16 +74,14 @@ public interface IBatchProcessor {
                             for (int i = 0; i < index; i++) {
                                 arr[i] = BlockTypesCache.ReservedIDs.__RESERVED__;
                             }
-                        } else {
-                            arr = new char[4096];
-                        }
                             set.setBlocks(layer, arr);
+                        }
                     } else {
                         set.setBlocks(layer, null);
                     }
                 }
             }
-            for (int layer = maxLayer; layer < set.getMaxSectionPosition(); layer++) {
+            for (int layer = maxLayer; layer <= set.getMaxSectionPosition(); layer++) {
                 if (set.hasSection(layer)) {
                     if (layer == maxLayer) {
                         char[] arr = set.loadIfPresent(layer);
@@ -92,10 +90,8 @@ public interface IBatchProcessor {
                             for (int i = index; i < arr.length; i++) {
                                 arr[i] = BlockTypesCache.ReservedIDs.__RESERVED__;
                             }
-                        } else {
-                            arr = new char[4096];
-                        }
                             set.setBlocks(layer, arr);
+                        }
                     } else {
                         set.setBlocks(layer, null);
                     }

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

@@ -828,7 +828,7 @@ public class CuboidRegion extends AbstractRegion implements FlatRegion {
                 return set;
             }
 
-            for (int layer = get.getMinSectionPosition(); layer < get.getMaxSectionPosition(); layer++) {
+            for (int layer = get.getMinSectionPosition(); layer <= get.getMaxSectionPosition(); layer++) {
                 if (!set.hasSection(layer)) {
                     continue;
                 }
@@ -912,7 +912,7 @@ public class CuboidRegion extends AbstractRegion implements FlatRegion {
             boolean trimX = lowerX != 0 || upperX != 15;
             boolean trimZ = lowerZ != 0 || upperZ != 15;
 
-            for (int layer = get.getMinSectionPosition(); layer < get.getMaxSectionPosition(); layer++) {
+            for (int layer = get.getMinSectionPosition(); layer <= get.getMaxSectionPosition(); layer++) {
                 if (!set.hasSection(layer)) {
                     continue;
                 }