Fix Luacheck warnings on Ubuntu 22.04

src/caches.lua

@@ -242,7 +242,7 @@ local function resolve_aliases(hash)
 			end
 		end
 
-		if newname ~= "" and i3.recipes_cache[oldname] and not hash[newname] then
+		if newname ~= "" and i3.recipes_cache[oldname] and reg_items[newname] and not hash[newname] then
 			insert(i3.init_items, newname)
 		end
 	end

src/common.lua

@@ -101,7 +101,7 @@ local function search(data)
 	for i = 1, #data.items_raw do
 		local item = data.items_raw[i]
 		local def = reg_items[item]
-		local desc = lower(translate(data.lang_code, def and def.description)) or ""
+		local desc = lower(translate(data.lang_code, def.description)) or ""
 		local search_in = fmt("%s %s", item, desc)
 		local temp, j, to_add = {}, 1
 

src/fields.lua

@@ -215,10 +215,10 @@ local function inv_fields(player, data, fields)
 	return set_fs(player)
 end
 
-local function select_item(player, data, _f)
+local function select_item(player, data, fields)
 	local item
 
-	for field in pairs(_f) do
+	for field in pairs(fields) do
 		if find(field, ":") then
 			item = field
 			break

src/gui.lua

@@ -829,7 +829,7 @@ local function get_tooltip(item, info, pos)
 	return fmt("tooltip[%s;%s]", item, ESC(tooltip))
 end
 
-local function get_output_fs(fs, data, rcp, is_recipe, shapeless, right, btn_size, _btn_size)
+local function get_output_fs(fs, data, rcp, is_recipe, shapeless, right, btn_size, btn_size2)
 	local custom_recipe = i3.craft_types[rcp.type]
 	local cooking = rcp.type == "cooking"
 	local fuel = rcp.type == "fuel"
@@ -866,7 +866,7 @@ local function get_output_fs(fs, data, rcp, is_recipe, shapeless, right, btn_siz
 	end
 
 	local BTN_SIZE = i3.settings.item_btn_size
-	local arrow_X = right + 0.2 + (_btn_size or BTN_SIZE)
+	local arrow_X = right + 0.2 + (btn_size2 or BTN_SIZE)
 	local X = arrow_X + 1.2
 	local Y = data.yoffset + 1.4
 

src/styles.lua

@@ -74,6 +74,7 @@ local styles = string.format([[
 	style_type[image_button,item_image_button,checkbox,dropdown;border=false;sound=i3_click]
 	style_type[item_image_button;bgimg_hovered=%s]
 
+	style[;sound=]
 	style[nofav;sound=i3_cannot]
 	style[pagenum,no_item,no_rcp;font=bold;font_size=18]
 	style[exit;fgimg=%s;fgimg_hovered=%s;content_offset=0]