Factorio Forums

Steps to reproduce:

• Enter a world and place a Requester chest
• Hover over the chest and run
• /c chest = game.player.selected
• Create a mod GUI inventory with the commands
• /c frame = game.player.gui.screen.add{type = "frame", caption = "Test"}
• /c inv = frame.add{type = "inventory", slots_per_row = 10, empty_slot_info = {sprite = "utility/empty_module_slot"}}
• /c inv.inventory = chest.get_inventory(defines.inventory.chest)

Clicking the red X in either the mod GUI or the real chest followed by a corresponding inventory slot will successfully change the bar (the red slots limited from insertion).
However, these slots are not drawn in the mod GUI because an empty slot sprite has been defined.
Clearing the sprite using /c inv.empty_slot_info = nil produces the expected behaviour:
(Ignore that the bar is in a different place, I moved it.)

Thanks for the report however I'm not sure if this is fixable. GUIs were never designed to have both bars and empty slot info at the same time - as such - the logic to handle it just doesn't exist. The bar color is part of the slot style and by having empty slot info defined *that* style is always drawn.