fix: do not overwrite bedrock with wall

- Fixes #4047

Core/src/main/java/com/plotsquared/core/command/Auto.java

@@ -296,10 +296,13 @@ public class Auto extends SubCommand {
         }
         if (this.econHandler != null && plotarea.useEconomy()) {
             PlotExpression costExp = plotarea.getPrices().get("claim");
+            PlotExpression mergeCostExp = plotarea.getPrices().get("merge");
+            int size = sizeX * sizeZ;
+            double mergeCost = size > 1 && mergeCostExp == null ? 0d : mergeCostExp.evaluate(size);
             double cost = costExp.evaluate(Settings.Limit.GLOBAL ?
                     player.getPlotCount() :
                     player.getPlotCount(plotarea.getWorldName()));
-            cost = (sizeX * sizeZ) * cost;
+            cost = size * cost + mergeCost;
             if (cost > 0d) {
                 if (!this.econHandler.isSupported()) {
                     player.sendMessage(TranslatableCaption.of("economy.vault_or_consumer_null"));

Core/src/main/java/com/plotsquared/core/generator/ClassicPlotManager.java

@@ -379,10 +379,11 @@ public class ClassicPlotManager extends SquarePlotManager {
             }
         }
 
+        int yStart = classicPlotWorld.getMinBuildHeight() + (classicPlotWorld.PLOT_BEDROCK ? 1 : 0);
         if (!plot.isMerged(Direction.NORTH)) {
             int z = bot.getZ();
             for (int x = bot.getX(); x < top.getX(); x++) {
-                for (int y = classicPlotWorld.getMinBuildHeight(); y <= classicPlotWorld.WALL_HEIGHT; y++) {
+                for (int y = yStart; y <= classicPlotWorld.WALL_HEIGHT; y++) {
                     queue.setBlock(x, y, z, blocks);
                 }
             }
@@ -390,7 +391,7 @@ public class ClassicPlotManager extends SquarePlotManager {
         if (!plot.isMerged(Direction.WEST)) {
             int x = bot.getX();
             for (int z = bot.getZ(); z < top.getZ(); z++) {
-                for (int y = classicPlotWorld.getMinBuildHeight(); y <= classicPlotWorld.WALL_HEIGHT; y++) {
+                for (int y = yStart; y <= classicPlotWorld.WALL_HEIGHT; y++) {
                     queue.setBlock(x, y, z, blocks);
                 }
             }
@@ -398,7 +399,7 @@ public class ClassicPlotManager extends SquarePlotManager {
         if (!plot.isMerged(Direction.SOUTH)) {
             int z = top.getZ();
             for (int x = bot.getX(); x < top.getX() + (plot.isMerged(Direction.EAST) ? 0 : 1); x++) {
-                for (int y = classicPlotWorld.getMinBuildHeight(); y <= classicPlotWorld.WALL_HEIGHT; y++) {
+                for (int y = yStart; y <= classicPlotWorld.WALL_HEIGHT; y++) {
                     queue.setBlock(x, y, z, blocks);
                 }
             }
@@ -406,7 +407,7 @@ public class ClassicPlotManager extends SquarePlotManager {
         if (!plot.isMerged(Direction.EAST)) {
             int x = top.getX();
             for (int z = bot.getZ(); z < top.getZ() + (plot.isMerged(Direction.SOUTH) ? 0 : 1); z++) {
-                for (int y = classicPlotWorld.getMinBuildHeight(); y <= classicPlotWorld.WALL_HEIGHT; y++) {
+                for (int y = yStart; y <= classicPlotWorld.WALL_HEIGHT; y++) {
                     queue.setBlock(x, y, z, blocks);
                 }
             }