Crash when attempting to perform a layout with a zero frame size #26
Description
I've been seeing a crash in Bookmarks on macOS when attempting to perform a layout pass and the frame is zero. Definitely a result of a behavior change in the latest incarnation of SwiftUI. It's currently unclear to me if this is an actual SwiftUI bug, or an issue in the layout logic / custom constraints resolution in SelectableCollectionView. Either way, ideally SelectableCollectionView should be robust to this kind of issue though and we should add a test case for this and guard against it if possible.