Fix claim visuals not reverting properly. Fixes #1

* Fix version.
* Ignore '_nextClaimID' file during GP Bukkit migration.

bukkit/src/main/java/com/griefdefender/GDPlayerData.java

@@ -180,8 +180,9 @@ public void revertActiveVisual(Player player) {
             this.visualRevertTask = null;
         }
 
+        GDClaim claim = null;
         if (this.visualClaimId != null) {
-            GDClaim claim = (GDClaim) GriefDefenderPlugin.getInstance().dataStore.getClaim(this.worldUniqueId, this.visualClaimId);
+            claim = (GDClaim) GriefDefenderPlugin.getInstance().dataStore.getClaim(this.worldUniqueId, this.visualClaimId);
             if (claim != null) {
                 claim.playersWatching.remove(this.playerID);
             }
@@ -193,6 +194,13 @@ public void revertActiveVisual(Player player) {
 
         for (int i = 0; i < this.visualBlocks.size(); i++) {
             BlockSnapshot snapshot = this.visualBlocks.get(i).getOriginal();
+            // If original block does not exist, do not send to player
+            if (NMSUtil.getInstance().getBlockData(snapshot.getLocation().getBlock()) != snapshot.getState()) {
+                if (claim != null) {
+                    claim.markVisualDirty = true;
+                }
+                continue;
+            }
             NMSUtil.getInstance().sendBlockChange(player, snapshot);
         }
     }

bukkit/src/main/java/com/griefdefender/GriefDefenderPlugin.java

@@ -189,15 +189,14 @@ public class GriefDefenderPlugin {
     public static final String MOD_ID = "GriefDefender";
     public static final String API_VERSION = GriefDefenderPlugin.class.getPackage().getSpecificationVersion();
     public static final String IMPLEMENTATION_NAME = GriefDefenderPlugin.class.getPackage().getImplementationTitle();
-    public static final String IMPLEMENTATION_VERSION =  GriefDefenderPlugin.class.getPackage().getImplementationVersion();
-    public static String VERSION = "1.0.0";
+    public static final String IMPLEMENTATION_VERSION =  GriefDefenderPlugin.class.getPackage().getImplementationVersion() == null ? "unknown" : GriefDefenderPlugin.class.getPackage().getImplementationVersion();
     private Path configPath = Paths.get(".", "plugins", "GriefDefender");
     public MessageStorage messageStorage;
     public MessageDataConfig messageData;
     public Map<UUID, Random> worldGeneratorRandoms = new HashMap<>();
     public static ClaimBlockSystem CLAIM_BLOCK_SYSTEM;
 
-    public static final String CONFIG_HEADER = "1.0.0\n"
+    public static final String CONFIG_HEADER = IMPLEMENTATION_VERSION + "\n"
             + "# If you need help with the configuration or have any issues related to GriefDefender,\n"
             + "# create a ticket on https://github.com/bloodmc/GriefDefender/issues.\n"
             + "# Note: If you have not purchased GriefDefender, please consider doing so to get \n"

bukkit/src/main/java/com/griefdefender/claim/GDClaim.java

@@ -131,6 +131,7 @@ public class GDClaim implements Claim {
     private UUID ownerUniqueId;
 
     public boolean cuboid = false;
+    public boolean markVisualDirty = false;
 
     protected ClaimStorageData claimStorage;
     protected IClaimData claimData;
@@ -243,8 +244,9 @@ public void setType(ClaimType type) {
     }
 
     public ClaimVisual getVisualizer() {
-        if (this.claimVisual == null) {
+        if (this.claimVisual == null || this.markVisualDirty) {
             this.claimVisual = new ClaimVisual(this, ClaimVisual.getClaimVisualType(this));
+            this.markVisualDirty = false;
         }
         return this.claimVisual;
     }

bukkit/src/main/java/com/griefdefender/command/CommandGDVersion.java

@@ -47,16 +47,10 @@ public class CommandGDVersion extends BaseCommand {
     @Subcommand("version")
     public void execute(CommandSender src) {
 
-        String version = GriefDefenderPlugin.IMPLEMENTATION_VERSION;
-        if (version == null) {
-            version = "unknown";
-        }
-
         Component gpVersion = TextComponent.builder("")
                 .append(GriefDefenderPlugin.GD_TEXT)
                 .append("Running ")
-                // TODO : Use version from manifest
-                .append("GriefDefender " + GriefDefenderPlugin.VERSION, TextColor.AQUA)
+                .append("GriefDefender " + GriefDefenderPlugin.IMPLEMENTATION_VERSION, TextColor.AQUA)
                 .build();
         Component bukkitVersion = TextComponent.builder("")
                 .append(GriefDefenderPlugin.GD_TEXT)

bukkit/src/main/java/com/griefdefender/listener/BlockEventHandler.java

@@ -526,6 +526,8 @@ public void onBlockBreak(BlockBreakEvent event) {
                 GriefDefenderPlugin.sendClaimDenyMessage(targetClaim, player, message);
             }
             event.setCancelled(true);
+        } else {
+            targetClaim.markVisualDirty = true;
         }
 
         GDTimings.BLOCK_BREAK_EVENT.stopTiming();

bukkit/src/main/java/com/griefdefender/migrator/GriefPreventionMigrator.java

@@ -76,6 +76,10 @@ public static void migrate(World world, Path gpClassicDataPath) throws FileNotFo
                         int claimId = Integer.parseInt(file.getName().replaceFirst("[.][^.]+$", ""));
                         idToUUID.put(claimId, UUID.randomUUID());
                     } catch (NumberFormatException e) {
+                        if (file.getName().equalsIgnoreCase("_nextClaimID")) {
+                            // GP keeps track of next claim ID in this file so we can safely ignore the exception
+                            continue;
+                        }
                         e.printStackTrace();
                         continue;
                     }