Include namespace in modded registry tag path (FabricMC#3303)

* Include namespace in modded registry tag path

* Document tag namespace change

fabric-registry-sync-v0/src/main/java/net/fabricmc/fabric/api/event/registry/DynamicRegistries.java

@@ -37,6 +37,10 @@
  * <p>The list of all dynamic registries, whether from vanilla or mods, can be accessed using
  * {@link #getDynamicRegistries()}.
  *
+ * <p>Tags for the entries of a custom registry must be placed in
+ * {@code /tags/<registry namespace>/<registry path>/}. For example, the tags for the example
+ * registry below would be placed in {@code /tags/my_mod/my_data/}.
+ *
  * <h2 id="sync">Synchronization</h2>
  * Dynamic registries are not synchronized to the client by default.
  * To register a <em>synced dynamic registry</em>, you can replace the {@link #register} call

fabric-registry-sync-v0/src/main/java/net/fabricmc/fabric/api/event/registry/FabricRegistryBuilder.java

@@ -44,6 +44,10 @@
  * 	}
  * </pre>
  *
+ * <p>Tags for the entries of a custom registry must be placed in
+ * {@code /tags/<registry namespace>/<registry path>/}. For example, the tags for the example
+ * registry above would be placed in {@code /tags/modid/registry_name/}.
+ *
  * @param <T> The type stored in the Registry
  * @param <R> The registry type
  */

fabric-registry-sync-v0/src/main/java/net/fabricmc/fabric/mixin/registry/sync/TagManagerLoaderMixin.java

@@ -26,22 +26,16 @@
 import net.minecraft.registry.tag.TagManagerLoader;
 import net.minecraft.util.Identifier;
 
-import net.fabricmc.fabric.impl.registry.sync.DynamicRegistriesImpl;
-
 // Adds namespaces to tag directories for registries added by mods.
 @Mixin(TagManagerLoader.class)
 abstract class TagManagerLoaderMixin {
 	@Inject(method = "getPath", at = @At("HEAD"), cancellable = true)
 	private static void onGetPath(RegistryKey<? extends Registry<?>> registry, CallbackInfoReturnable<String> info) {
-		// TODO: Expand this change to static registries in the future.
-		if (!DynamicRegistriesImpl.DYNAMIC_REGISTRY_KEYS.contains(registry)) {
-			return;
-		}
-
 		Identifier id = registry.getValue();
 
 		// Vanilla doesn't mark namespaces in the directories of tags at all,
 		// so we prepend the directories with the namespace if it's a modded registry id.
+		// No need to check DIRECTORIES, since this is only used by vanilla registries.
 		if (!id.getNamespace().equals(Identifier.DEFAULT_NAMESPACE)) {
 			info.setReturnValue("tags/" + id.getNamespace() + "/" + id.getPath());
 		}