fix: Should fix the disconnect issue when pretty much all existing spell packs are present in the game

Mods were registering spells on the client and server side in a different order (perhaps related to the OS), causing a mismatch in spell networkIDs. This will ensure that spells are sorted alphabetically and redistributes a new ID.

src/main/java/electroblob/wizardry/Wizardry.java

@@ -20,6 +20,7 @@ import electroblob.wizardry.registry.WizardryItems;
 import electroblob.wizardry.registry.WizardryLoot;
 import electroblob.wizardry.registry.WizardrySounds;
 import electroblob.wizardry.spell.Spell;
+import electroblob.wizardry.util.SpellNetworkIDSorter;
 import electroblob.wizardry.util.SpellProperties;
 import electroblob.wizardry.util.WandHelper;
 import electroblob.wizardry.worldgen.WorldGenCrystalFlower;
@@ -202,6 +203,8 @@ public class Wizardry {
 	public void postInit(FMLPostInitializationEvent event){
 		proxy.initialiseLayers();
 		proxy.initialiseAnimations();
+
+		SpellNetworkIDSorter.init();
 	}
 
 	@EventHandler

src/main/java/electroblob/wizardry/spell/Spell.java

@@ -189,7 +189,7 @@ public abstract class Spell extends IForgeRegistryEntry.Impl<Spell> implements C
 	private static int nextSpellId = 0;
 	/** The spell's integer ID, mainly used for networking. */
 	// This was added after I learnt the hard way why you can't assume Forge's registry IDs are sequential...
-	private final int id;
+	private int id;
 
 	/**
 	 * This constructor should be called from any subclasses, either feeding in the constants directly or through their
@@ -225,6 +225,7 @@ public abstract class Spell extends IForgeRegistryEntry.Impl<Spell> implements C
 		this.icon = new ResourceLocation(modID, "textures/spells/" + name + ".png");
 		this.sounds = createSounds();
 		this.id = nextSpellId++;
+		Wizardry.logger.debug("Registering spell " + this.unlocalisedName +" with networkID " + id);
 		this.items(WizardryItems.spell_book, WizardryItems.scroll);
 		this.npcSelector((e, o) -> false);
 	}
@@ -560,6 +561,11 @@ public abstract class Spell extends IForgeRegistryEntry.Impl<Spell> implements C
 		return id;
 	}
 
+	/** Sets the networkID of this spell. Do not call this or it will cause all packets to fail. */
+	public void setId(int id) {
+		this.id = id;
+	}
+
 	/** Returns the {@code ResourceLocation} for this spell's icon. */
 	public final ResourceLocation getIcon(){
 		return icon;

src/main/java/electroblob/wizardry/util/SpellNetworkIDSorter.java

@@ -0,0 +1,32 @@
+package electroblob.wizardry.util;
+
+import electroblob.wizardry.Wizardry;
+import electroblob.wizardry.spell.Spell;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Helper class which ensures that all spellpack spell networkIDs are distributed in alphabetical order. Introducing this was necessary as mods (especially with
+ * (load-after) dependencies were not always registering their spells in the exact same order. This is definitely
+ */
+public class SpellNetworkIDSorter {
+
+	public static void init() {
+
+		//reorder network IDs based on addon modids. This is necessary as modloading order doesn't seem to be guaranteed to match between various servers and clients
+		Wizardry.logger.debug("Reordering all spell NetworkIDs based on addon modid alphabetical order");
+
+		// the first available ID after all default spells
+		int nextSpellId = (int) Spell.getAllSpells().stream().filter(spell -> spell.getRegistryName().getNamespace().equals(Wizardry.MODID)).count() + 1;
+		List<Spell> addonSpells = Spell.getAllSpells().stream().filter(spell -> !spell.getRegistryName().getNamespace().equals(Wizardry.MODID)).collect(Collectors.toList());
+
+		// sorting spells
+		addonSpells.sort(Comparator.comparing((Spell o) -> o.getRegistryName().toString()));
+		for (Spell spell : addonSpells) {
+			Wizardry.logger.debug("Updating networkID of spell " + spell.getRegistryName().toString() + " from " + spell.networkID() + " to " + nextSpellId);
+			spell.setId(nextSpellId++);
+		}
+	}
+}