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	Do not show item overlay if slot is occupied by item (bookshelf, vessels shelf)
This commit is contained in:
		@@ -1815,16 +1815,23 @@ local bookshelf_formspec =
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	"listring[current_player;main]" ..
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	default.get_hotbar_bg(0,2.85)
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-- Inventory slots overlay
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local bx, by = 0, 0.3
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for i = 1, 16 do
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	if i == 9 then
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		bx = 0
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		by = by + 1
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local function get_bookshelf_formspec(inv)
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	local formspec = bookshelf_formspec
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	local invlist = inv and inv:get_list("books")
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	-- Inventory slots overlay
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	local bx, by = 0, 0.3
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	for i = 1, 16 do
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		if i == 9 then
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			bx = 0
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			by = by + 1
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		end
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		if not invlist or invlist[i]:is_empty() then
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			formspec = formspec ..
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				"image[" .. bx .. "," .. by .. ";1,1;default_bookshelf_slot.png]"
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		end
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		bx = bx + 1
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	end
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	bookshelf_formspec = bookshelf_formspec ..
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		"image[" .. bx .. "," .. by .. ";1,1;default_bookshelf_slot.png]"
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	bx = bx + 1
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	return formspec
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end
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minetest.register_node("default:bookshelf", {
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@@ -1838,7 +1845,7 @@ minetest.register_node("default:bookshelf", {
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	on_construct = function(pos)
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		local meta = minetest.get_meta(pos)
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		meta:set_string("formspec", bookshelf_formspec)
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		meta:set_string("formspec", get_bookshelf_formspec(nil))
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		local inv = meta:get_inventory()
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		inv:set_size("books", 8 * 2)
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	end,
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@@ -1855,14 +1862,20 @@ minetest.register_node("default:bookshelf", {
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	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
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		minetest.log("action", player:get_player_name() ..
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			" moves stuff in bookshelf at " .. minetest.pos_to_string(pos))
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		local meta = minetest.get_meta(pos)
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		meta:set_string("formspec", get_bookshelf_formspec(meta:get_inventory()))
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	end,
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	on_metadata_inventory_put = function(pos, listname, index, stack, player)
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		minetest.log("action", player:get_player_name() ..
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			" moves stuff to bookshelf at " .. minetest.pos_to_string(pos))
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		local meta = minetest.get_meta(pos)
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		meta:set_string("formspec", get_bookshelf_formspec(meta:get_inventory()))
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	end,
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	on_metadata_inventory_take = function(pos, listname, index, stack, player)
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		minetest.log("action", player:get_player_name() ..
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			" takes stuff from bookshelf at " .. minetest.pos_to_string(pos))
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		local meta = minetest.get_meta(pos)
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		meta:set_string("formspec", get_bookshelf_formspec(meta:get_inventory()))
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	end,
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	on_blast = function(pos)
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		local drops = {}
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@@ -13,16 +13,23 @@ local vessels_shelf_formspec =
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	"listring[current_player;main]" ..
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	default.get_hotbar_bg(0, 2.85)
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-- Inventory slots overlay
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local vx, vy = 0, 0.3
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for i = 1, 16 do
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	if i == 9 then
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		vx = 0
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		vy = vy + 1
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local function get_vessels_shelf_formspec(inv)
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	local formspec = vessels_shelf_formspec
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	local invlist = inv and inv:get_list("vessels")
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	-- Inventory slots overlay
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	local vx, vy = 0, 0.3
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	for i = 1, 16 do
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		if i == 9 then
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			vx = 0
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			vy = vy + 1
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		end
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		if not invlist or invlist[i]:is_empty() then
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			formspec = formspec ..
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				"image[" .. vx .. "," .. vy .. ";1,1;vessels_shelf_slot.png]"
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		end
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		vx = vx + 1
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	end
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	vessels_shelf_formspec = vessels_shelf_formspec ..
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		"image[" .. vx .. "," .. vy .. ";1,1;vessels_shelf_slot.png]"
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	vx = vx + 1
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	return formspec
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end
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minetest.register_node("vessels:shelf", {
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@@ -36,7 +43,7 @@ minetest.register_node("vessels:shelf", {
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	on_construct = function(pos)
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		local meta = minetest.get_meta(pos)
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		meta:set_string("formspec", vessels_shelf_formspec)
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		meta:set_string("formspec", get_vessels_shelf_formspec(nil))
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		local inv = meta:get_inventory()
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		inv:set_size("vessels", 8 * 2)
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	end,
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@@ -53,14 +60,20 @@ minetest.register_node("vessels:shelf", {
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	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
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		minetest.log("action", player:get_player_name() ..
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			   " moves stuff in vessels shelf at ".. minetest.pos_to_string(pos))
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		local meta = minetest.get_meta(pos)
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		meta:set_string("formspec", get_vessels_shelf_formspec(meta:get_inventory()))
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	end,
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	on_metadata_inventory_put = function(pos, listname, index, stack, player)
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		minetest.log("action", player:get_player_name() ..
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			   " moves stuff to vessels shelf at ".. minetest.pos_to_string(pos))
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		local meta = minetest.get_meta(pos)
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		meta:set_string("formspec", get_vessels_shelf_formspec(meta:get_inventory()))
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	end,
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	on_metadata_inventory_take = function(pos, listname, index, stack, player)
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		minetest.log("action", player:get_player_name() ..
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			   " takes stuff from vessels shelf at ".. minetest.pos_to_string(pos))
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		local meta = minetest.get_meta(pos)
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		meta:set_string("formspec", get_vessels_shelf_formspec(meta:get_inventory()))
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	end,
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	on_blast = function(pos)
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		local drops = {}
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