Detached inventory on_deactivate test

a 2nd "Testy" inv will be created with every inv-entity on this
testing branch which you can access with /invtest. This was to
verify that on_deactivate is in fact called by /clearobjects:

place a chest boat,
run /invtest - verify the inventory works
run /clearobjects - verify the inv no longer works

mods/ENTITIES/mcl_entity_invs/init.lua

@@ -25,7 +25,9 @@ local function load_inv(ent,size)
 	local inv = minetest.get_inventory({type="detached", name=ent._inv_id})
 	if not inv then
 		inv =  minetest.create_detached_inventory(ent._inv_id, inv_callbacks)
+		invt =  minetest.create_detached_inventory("testy", {})
 		inv:set_size("main", size)
+		invt:set_size("main", size)
 		if ent._items then
 			inv:set_list("main",ent._items)
 		end
@@ -98,6 +100,7 @@ function mcl_entity_invs.register_inv(entity_name,show_name,size)
 	local old_ode = minetest.registered_entities[entity_name].on_deactivate
 	minetest.registered_entities[entity_name].on_deactivate = function(self,removal)
 		minetest.remove_detached_inventory(self._inv_id)
+		minetest.remove_detached_inventory("testy")
 		if old_ode then return old_ode(self,removal) end
 	end
 
@@ -108,3 +111,20 @@ function mcl_entity_invs.register_inv(entity_name,show_name,size)
 		if old_od then return old_od(self,clicker) end
 	end
 end
+
+minetest.register_chatcommand("invtest",{func=function(n,p)
+	local formspec = "size[9,8.75]"
+	.. "label[0,0;" .. minetest.formspec_escape(
+			minetest.colorize("#313131", "Testy")) .. "]"
+	.. "list[detached:testy;main;0,0.5;9,3;]"
+	.. mcl_formspec.get_itemslot_bg(0,0.5,9,3)
+	.. "label[0,4.0;" .. minetest.formspec_escape(
+			minetest.colorize("#313131", "Inventory")) .. "]"
+	.. "list[current_player;main;0,4.5;9,3;9]"
+	.. mcl_formspec.get_itemslot_bg(0,4.5,9,3)
+	.. "list[current_player;main;0,7.74;9,1;]"
+	.. mcl_formspec.get_itemslot_bg(0,7.74,9,1)
+	.. "listring[detached:testy;main]"
+	.. "listring[current_player;main]"
+	minetest.show_formspec(n,"testy",formspec)
+end})