Describe the solution you'd like
At the moment if you don't have enough items in your inventory, you'll see the + button in red with a message you don't have enough materials. It doesn't actually show you what materials those are. Some way to highlight this (like JEI does by making the missing blocks red or being able to click the red + but only the non-missing items will be inserted into the crafting table) would be a very nice way to quickly see what you need.

This has been added.