Function shared_flip 

pub fn shared_flip(id: impl Into<SharedString>, cx: &mut App) -> Flip

The slide handle for id, kept alive across a handoff between two element trees.

A row that opens into a detail panel is two elements in two trees with one identity. Because the state is keyed by id rather than by element, the panel inverts from the rectangle the row last recorded and travels there instead of cutting. What this adds over flip is only patience: the rectangle survives the frames in which neither tree renders the id, up to 30 frames and 500 ms of wall clock, whichever ends first. Past that the arriving element is simply already in place.

Both trees rendering the id at once is a collision, and a collision does not animate; see Flip::is_contended.