fix sensitive blocks attached to sf blocks not dropping (1.19+)

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/listeners/BlockListener.java

@@ -14,6 +14,7 @@
 import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
+import org.bukkit.block.data.BlockData;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
@@ -25,6 +26,7 @@
 import org.bukkit.inventory.meta.ItemMeta;
 
 import io.github.bakedlibs.dough.protection.Interaction;
+import io.github.thebusybiscuit.slimefun4.api.MinecraftVersion;
 import io.github.thebusybiscuit.slimefun4.api.events.ExplosiveToolBreakBlocksEvent;
 import io.github.thebusybiscuit.slimefun4.api.events.SlimefunBlockBreakEvent;
 import io.github.thebusybiscuit.slimefun4.api.events.SlimefunBlockPlaceEvent;
@@ -53,6 +55,8 @@
  */
 public class BlockListener implements Listener {
 
+    private static final BlockFace[] CARDINAL_BLOCKFACES = new BlockFace[]{BlockFace.WEST, BlockFace.EAST, BlockFace.NORTH, BlockFace.SOUTH, BlockFace.DOWN, BlockFace.UP};
+
     public BlockListener(@Nonnull Slimefun plugin) {
         plugin.getServer().getPluginManager().registerEvents(this, plugin);
     }
@@ -152,6 +156,9 @@ public void onBlockBreak(BlockBreakEvent e) {
             }
 
             callBlockHandler(e, item, drops, sfItem);
+
+            checkForSensitiveBlocks(e.getBlock(), 0);
+
             dropItems(e, drops);
         }
     }
@@ -222,6 +229,52 @@ private void dropItems(BlockBreakEvent e, List<ItemStack> drops) {
         }
     }
 
+    /**
+     * This method checks recursively for any sensitive blocks
+     * that are no longer supported due to this block breaking
+     *
+     * @param block
+     *      The {@link Block} in question
+     * @param c
+     *      The amount of times this has been recursively called
+     */
+    @ParametersAreNonnullByDefault
+    private void checkForSensitiveBlocks(Block block, Integer c) {
+        if (c >= Bukkit.getServer().getMaxChainedNeighborUpdates()) {
+            return;
+        }
+        for (BlockFace face : CARDINAL_BLOCKFACES) {
+            block.setType(Material.AIR, false);
+            if (!isSupported(block.getRelative(face).getBlockData(), block.getRelative(face))) {
+                Block relative = block.getRelative(face);
+                for (ItemStack drop : relative.getDrops()) {
+                    block.getWorld().dropItemNaturally(relative.getLocation(), drop);
+                }
+                checkForSensitiveBlocks(relative, ++c);
+            }
+        }
+    }
+
+    /**
+     * This method checks if the {@link BlockData} would be
+     * supported at the given {@link Block}.
+     *
+     * @param blockData
+     *      The {@link BlockData} to check
+     * @param block
+     *      The {@link Block} the {@link BlockData} would be at
+     * @return
+     *      Whether the {@link BlockData} would be supported at the given {@link Block}
+     */
+    private boolean isSupported(BlockData blockData, Block block) {
+        if (Slimefun.getMinecraftVersion().isAtLeast(MinecraftVersion.MINECRAFT_1_19)) {
+            return blockData.isSupported(block);
+        } else {
+            // TODO: Make 1.16-1.18 version. BlockData::isSupported is 1.19+.
+            return true;
+        }
+    }
+
     /**
      * This method checks for a sensitive {@link Block}.
      * Sensitive {@link Block Blocks} are pressure plates or saplings, which should be broken