Fix #46: Spawn raids on raid's region

Author: PureGero

shreddedpaper-server/minecraft-patches/sources/net/minecraft/world/effect/RaidOmenMobEffect.java.patch

@@ -0,0 +1,19 @@
+--- a/net/minecraft/world/effect/RaidOmenMobEffect.java
++++ b/net/minecraft/world/effect/RaidOmenMobEffect.java
+@@ -1,5 +_,6 @@
+ package net.minecraft.world.effect;
+ 
++import io.multipaper.shreddedpaper.ShreddedPaper;
+ import net.minecraft.core.BlockPos;
+ import net.minecraft.core.particles.ParticleOptions;
+ import net.minecraft.server.level.ServerLevel;
+@@ -21,7 +_,9 @@
+         if (entity instanceof ServerPlayer serverPlayer && !entity.isSpectator()) {
+             BlockPos raidOmenPosition = serverPlayer.getRaidOmenPosition();
+             if (raidOmenPosition != null) {
++                ShreddedPaper.runSync(level, raidOmenPosition, () -> { // ShreddedPaper - run on raidOmenPosition's thread. Do not use ensureSync as createOrExtendRaid can call positions that are outside the player's thread
+                 level.getRaids().createOrExtendRaid(serverPlayer, raidOmenPosition);
++                }); // ShreddedPaper - run on raidOmenPosition's thread
+                 serverPlayer.clearRaidOmenPosition();
+                 return false;
+             }