Use full stacks in the creative inventory and add a trash field

mods/creative/init.lua

@@ -14,11 +14,7 @@ minetest.after(0, function()
 			end
 		end,
 		allow_put = function(inv, listname, index, stack, player)
-			if minetest.setting_getbool("creative_mode") then
-				return -1
-			else
-				return 0
-			end
+			return 0
 		end,
 		allow_take = function(inv, listname, index, stack, player)
 			if minetest.setting_getbool("creative_mode") then
@@ -54,8 +50,7 @@ minetest.after(0, function()
 		if stack:get_stack_max() == 1 then
 			stack2 = ItemStack(stack:get_name())
 		else
-			-- Insert half full so that a taken stack can be put back
-			stack2 = ItemStack(stack:get_name().." "..(stack:get_stack_max()/2))
+			stack2 = ItemStack(stack:get_name().." "..stack:get_stack_max())
 		end
 		inv:add_item("main", stack2)
 	end
@@ -63,6 +58,24 @@ minetest.after(0, function()
 	print("creative inventory size: "..dump(creative_inventory.creative_inventory_size))
 end)
 
+-- Create the trash field
+local trash = minetest.create_detached_inventory("creative_trash", {
+	-- Allow the stack to be placed and remove it in on_put()
+	-- This allows the creative inventory to restore the stack
+	allow_put = function(inv, listname, index, stack, player)
+		if minetest.setting_getbool("creative_mode") then
+			return stack:get_count()
+		else
+			return 0
+		end
+	end,
+	on_put = function(inv, listname, index, stack, player)
+		inv:set_stack(listname, index, "")
+	end,
+})
+trash:set_size("main", 1)
+
+
 creative_inventory.set_creative_formspec = function(player, start_i, pagenum)
 	pagenum = math.floor(pagenum)
 	local pagemax = math.floor((creative_inventory.creative_inventory_size-1) / (6*4) + 1)
@@ -74,7 +87,9 @@ creative_inventory.set_creative_formspec = function(player, start_i, pagenum)
 			"list[detached:creative;main;0.3,0.5;4,6;"..tostring(start_i).."]"..
 			"label[2.0,6.55;"..tostring(pagenum).."/"..tostring(pagemax).."]"..
 			"button[0.3,6.5;1.6,1;creative_prev;<<]"..
-			"button[2.7,6.5;1.6,1;creative_next;>>]")
+			"button[2.7,6.5;1.6,1;creative_next;>>]"..
+			"label[5,1.5;Trash:]"..
+			"list[detached:creative_trash;main;5,2;1,1;]")
 end
 minetest.register_on_joinplayer(function(player)
 	-- If in creative mode, modify player's inventory forms