Added option to blacklist inventory types from async display, fixing anvils

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/spigot/display/PacketWindowItems.kt

@@ -90,6 +90,11 @@ class PacketWindowItems(plugin: EcoPlugin) : AbstractPacketAdapter(plugin, Packe
     }
 
     private fun usingAsync(player: Player): Boolean {
+        if (this.getPlugin().configYml.getStrings("async-display.disable-on-types", false)
+                .map { it.lowercase() }.contains(player.openInventory.type.name.lowercase())) {
+            return false
+        }
+
         if (this.getPlugin().configYml.getBool("async-display.enabled")) {
             return true
         }

eco-core/core-plugin/src/main/resources/config.yml

@@ -54,6 +54,12 @@ async-display:
   # Log errors that occur in async processing.
   log-errors: true
 
+  # The inventory types that should never be processed asynchronously.
+  # A list of IDs can be found here:
+  # https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/event/inventory/InventoryType.html
+  disable-on-types:
+    - 'anvil'
+
   # If the server is running under heavy load (below a certain TPS value), enable
   # async display automatically. This can prevent some server crashes under load.
   emergency: