Improvements to captive items

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/EcoMenu.kt

@@ -49,11 +49,13 @@ class EcoMenu(
 
         player.openInventory(inventory)
         MenuHandler.registerInventory(inventory, this, player)
+        inventory.asRenderedInventory()?.generateCaptive()
         return inventory
     }
 
     fun handleClose(event: InventoryCloseEvent) {
         onClose.handle(event, this)
+        event.inventory.asRenderedInventory()?.generateCaptive()
         MenuHandler.unregisterInventory(event.inventory)
     }
 

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/MenuRenderedInventory.kt

@@ -34,7 +34,7 @@ class MenuRenderedInventory(
         menu.runOnRender(player)
     }
 
-    private fun generateCaptive() {
+    fun generateCaptive() {
         captiveItems.clear()
         for (i in 0 until inventory.size) {
             val (row, column) = MenuUtils.convertSlotToRowColumn(i)