Indicator if items of blueprint are in inventory

[FunMaker]

It would be cool if there would be an indicator that shows if all items of a blueprint currently picked up are available and the blueprint could be build completly. Implementation would be simple (compare inventory with blueprint entities or compare logistic network content with blueprint entities).

In some cases this is not just a convinient features but a must have. Some Combinator builds have to be build quickly and completly because some counters may differ or will have other side effects if they are not build in in close succession.