Closes the screen on top and returns the handle now on top (absent when the
stack is empty); origin stays the screen's origin.
screen must be the screen on top, else ScreenNotOnTopError; a tab or an
item that escaped the type is ScreenNotNavigableError; while another
computation's transition runs it is ScreenEnterConcurrentError. The app
pops one chain entry per entry the screen's enter recorded, so back emits
NavigateBack that many times; no ordinal is taken (448 DM capture). An
inner tab closes together with the screen it replaced. It is a transition,
so it runs alone and cannot be interrupted half-way; the closed frame's
leave runs after it.
Closes the screen on top and returns the handle now on top (absent when the stack is empty);
originstays the screen's origin.screenmust be the screen on top, elseScreenNotOnTopError; a tab or an item that escaped the type isScreenNotNavigableError; while another computation's transition runs it isScreenEnterConcurrentError. The app pops one chain entry per entry the screen's enter recorded, sobackemitsNavigateBackthat many times; no ordinal is taken (448 DM capture). An inner tab closes together with the screen it replaced. It is a transition, so it runs alone and cannot be interrupted half-way; the closed frame'sleaveruns after it.