I’m not sure that this is Sneaky or new or if I am just rather unobservant.
When you are adding imports statements the colouring of the text tells you whether is is valid / you have the right number of dots to get to the right level. So does the colour of the dots I think - white dots are invalid. All purple text is incorrect where as blue then purple is legit.
Still much easier to use autocomplete - which is not new but is amazing!