[2.1.11] Bar on "inventory" LuaGuiElement is not drawn with custom empty_slot sprite

[Shemp]

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).

inventory-bar-not-drawn.png (220.14 KiB) Viewed 130 times

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:

inventory-bar-does-draw.png (20.06 KiB) Viewed 130 times

(Ignore that the bar is in a different place, I moved it.)

[Rseding91]

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.