Initially this bug was only about allowing to assert that node is not visible for any reason In my use case I don't care for what reason the node is not displayed. Either it is because the node is not composed at all, or it was composed, but wasn't placed. This behaviour in LazyColumn is not guaranteed as prefetching can decide to precompose an item in advance. But currently we have

assertIsNotDisplayed() which is crashing if the node is not composed
assertDoesNotExist() which is crashing if the node composed, but not placed And there is no way to write it on my own because fetchSemanticsNode with boolean is internal

Aside from that we should have a solid strategy on how we work with deactivated items(the ones from lazy list reuse pool):

Do we filter out them by default?
Do we still provide an api to gather such nodes? There are tests in SubcomposeLayout and lazy which are exactly testing the reuse pool where it is needed
Do we need isPlaced() matcher in the public api as mentioned in #11