Print number of force loaded chunks per plugin in crash reports

src/main/java/org/bukkit/craftbukkit/CraftCrashReport.java

@@ -3,10 +3,13 @@ package org.bukkit.craftbukkit;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Map;
 import net.minecraft.server.CrashReportCallable;
 import net.minecraft.server.MinecraftServer;
 import org.bukkit.Bukkit;
+import org.bukkit.Chunk;
+import org.bukkit.World;
 import org.bukkit.craftbukkit.util.CraftMagicNumbers;
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginDescriptionFile;
@@ -31,6 +34,15 @@ public class CraftCrashReport implements CrashReportCallable<Object> {
                 value.append(' ').append(entry.getKey().getState().name()).append(' ').append(entry.getKey().getName()).append(": ").append(Arrays.toString(entry.getValue())).append(',');
             }
             value.append("}\n   ").append(Bukkit.getScheduler().toString());
+            value.append("\n   Force Loaded Chunks: {");
+            for (World world : Bukkit.getWorlds()) {
+                value.append(' ').append(world.getName()).append(": {");
+                for (Map.Entry<Plugin, Collection<Chunk>> entry : world.getPluginChunkTickets().entrySet()) {
+                    value.append(' ').append(entry.getKey().getDescription().getFullName()).append(": ").append(Integer.toString(entry.getValue().size())).append(',');
+                }
+                value.append("},");
+            }
+            value.append("}");
         } catch (Throwable t) {
             value.append("\n   Failed to handle CraftCrashReport:\n");
             PrintWriter writer = new PrintWriter(value);