Update tracer

BauSystem_Main/src/de/steamwar/bausystem/features/tracer/TraceManager.java

@@ -25,7 +25,9 @@ import de.steamwar.bausystem.features.tracer.rendering.dynamicflags.IsolateFlag;
 import de.steamwar.bausystem.region.Region;
 import de.steamwar.linkage.Linked;
 import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerQuitEvent;
 
 import java.util.*;
 
@@ -190,10 +192,6 @@ public class TraceManager implements Listener {
         });
     }
 
-    public boolean hasFollower(Player player) {
-        return followerMap.containsKey(player);
-    }
-
     public boolean follow(Player follower, Player following) {
         if (followerMap.containsKey(follower)) return false;
         followerMap.computeIfAbsent(following, ignored -> new HashSet<>()).add(follower);
@@ -298,4 +296,20 @@ public class TraceManager implements Listener {
             });
         });
     }
+
+    @EventHandler
+    public void onPlayerQuit(PlayerQuitEvent event) {
+        unfollow(event.getPlayer());
+        new ArrayList<>(followerMap.getOrDefault(event.getPlayer(), Collections.emptySet())).forEach(this::unfollow);
+
+        showDataPerRegionPerPlayer.forEach((region, playerPlayerTraceShowDataMap) -> {
+            playerPlayerTraceShowDataMap.remove(event.getPlayer());
+        });
+
+        tracesByRegion.forEach((region, integerTraceMap) -> {
+            integerTraceMap.forEach((integer, trace) -> {
+                trace.hide(event.getPlayer());
+            });
+        });
+    }
 }