ReadonlyonTop: The screen of the top frame, absent when the stack is empty.
Readonlyreason: "covered" | "navigation-moved"Readonlyscreen: stringThe screen (or item) the handle stands for.
Readonly_Optional Readonly~effect/Optional Readonly~effect/Optional Readonly~effect/Optional Readonly~effect/Optional Readonly~effect/OptionalcauseReadonlyonThe screen of the top frame, absent when the stack is empty.
ReadonlyreasonReadonlyscreenThe screen (or item) the handle stands for.
Optionalstack
A screen handle was used while it is not the screen on top:
back, an action or an edge (for an item: while its host is not on top), or a trail.covered— another frame is above it (or it was closed);navigation-moved— it is the top frame, but the navigation chain no longer ends with the entries its open recorded — another entry, or the same entry showing another screen (a raw navigation event, a raw top-tab switch or a brick moved the app elsewhere) — so the wire would show a chain the app cannot produce.