#344 element redraws and shorter assert messages

graphics/elements/listbox.lua

@@ -274,8 +274,20 @@ local function listbox(args)
         end
     end
 
-    draw_arrows(0)
-    draw_bar()
+    -- element redraw
+    function e.redraw()
+        draw_arrows(0)
+        draw_bar()
+
+        -- redraw all children
+        for i = 1, #list do
+            local item = list[i]    ---@type listbox_item
+            item.e.redraw()
+        end
+    end
+
+    -- initial draw
+    e.redraw()
 
     return e.complete()
 end