Add options to disable tab completion and extend username completion, also limit the total number of username suggestions to 200 per request

Bukkit/src/main/java/com/plotsquared/bukkit/listener/PaperListener.java

@@ -318,6 +318,9 @@ public class PaperListener implements Listener {
     }
 
     @EventHandler public void onAsyncTabCompletion(final AsyncTabCompleteEvent event) {
+        if (!Settings.Paper_Components.ASYNC_TAB_COMPLETION) {
+            return;
+        }
         String buffer = event.getBuffer();
         if (!(event.getSender() instanceof Player)) {
             return;

Core/src/main/java/com/plotsquared/core/configuration/Settings.java

@@ -238,7 +238,6 @@ public class Settings extends Config {
         @Comment("Force using lowercase UUIDs") public static boolean FORCE_LOWERCASE = false;
         @Comment("Use a database to store UUID/name info") public static boolean
             USE_SQLUUIDHANDLER = false;
-        @Ignore public static boolean NATIVE_UUID_PROVIDER = false;
         @Comment("How many UUIDs that may be stored in the cache")
         public static int UUID_CACHE_SIZE = 100000;
         @Comment("Rate limit (per 10 minutes) for background UUID fetching from the Mojang API")
@@ -497,6 +496,8 @@ public class Settings extends Config {
         public static boolean CREATURE_SPAWN = true;
         @Comment("Check the tile entity limit on block placement")
         public static boolean TILE_ENTITY_CHECK = true;
+        @Comment("Use Paper's async tab completion")
+        public static boolean ASYNC_TAB_COMPLETION;
     }
 
     @Comment("Settings relating to PlotSquared's GlobalBlockQueue")
@@ -514,8 +515,6 @@ public class Settings extends Config {
         @Comment("Events are needed to track a lot of things") public static boolean EVENTS = true;
         @Comment("Commands are used to interact with the plugin") public static boolean COMMANDS =
             true;
-        @Comment("The UUID cacher is used to resolve player names") public static boolean
-            UUID_CACHE = true;
         @Comment("Whether we should notify you about updates or not.") public static boolean
             UPDATE_NOTIFICATIONS = true;
         @Comment("Stores user metadata in a database") public static boolean PERSISTENT_META = true;
@@ -544,10 +543,10 @@ public class Settings extends Config {
         public static boolean EXTERNAL_PLACEHOLDERS = true;
         @Comment("Make road regeneration persistent across restarts") public static boolean
             PERSISTENT_ROAD_REGEN = false;
-        @Comment("Try to guess plot owners from sign data. This may decrease server performance")
-        public static boolean GUESS_PLOT_OWNER = false;
         @Comment("Plot component preset GUI")
         public static boolean COMPONENT_PRESETS = true;
+        @Comment("Use UUID cache to complete usernames")
+        public static boolean EXTENDED_USERNAME_COMPLETION = true;
     }
 
 }

Core/src/main/java/com/plotsquared/core/util/TabCompletions.java

@@ -31,6 +31,8 @@ import com.plotsquared.core.PlotSquared;
 import com.plotsquared.core.command.Command;
 import com.plotsquared.core.command.CommandCategory;
 import com.plotsquared.core.command.RequiredType;
+import com.plotsquared.core.configuration.Settings;
+import com.plotsquared.core.player.PlotPlayer;
 import com.plotsquared.core.uuid.UUIDMapping;
 import lombok.experimental.UtilityClass;
 import org.jetbrains.annotations.NotNull;
@@ -61,7 +63,9 @@ public class TabCompletions {
      */
     @NotNull public List<Command> completePlayers(@NotNull final String input,
         @NotNull final List<String> existing) {
-        List<String> players = cachedCompletionValues.getIfPresent("players");
+        List<String> players;
+        if (Settings.Enabled_Components.EXTENDED_USERNAME_COMPLETION) {
+            players = cachedCompletionValues.getIfPresent("players");
             if (players == null) {
                 final Collection<UUIDMapping> mappings =
                     PlotSquared.get().getImpromptuUUIDPipeline().getAllImmediately();
@@ -71,13 +75,23 @@ public class TabCompletions {
                 }
                 cachedCompletionValues.put("players", players);
             }
+        } else {
+            final Collection<? extends PlotPlayer> onlinePlayers = PlotSquared.imp().getPlayerManager().getPlayers();
+            players = new ArrayList<>(onlinePlayers.size());
+            for (final PlotPlayer player : onlinePlayers) {
+                players.add(player.getName());
+            }
+        }
         final String processedInput = input.toLowerCase(Locale.ENGLISH);
         return players.stream()
             .filter(player -> player.toLowerCase(Locale.ENGLISH).startsWith(processedInput))
             .filter(player -> !existing.contains(player)).map(
                 player -> new Command(null, false, player, "", RequiredType.NONE,
                     CommandCategory.INFO) {
-                }).collect(Collectors.toList());
+                })
+            /* If there are more than 200 suggestions, just send the first 200 */
+            .limit(200)
+            .collect(Collectors.toList());
     }
 
     /**