The overlay could not report a hub's own slow work: it paints only on
an empty stack, so over a screen kept up with stay() it draws nothing,
and it is not a screen at all, so it takes no keys either. A visited
hub stays armed the whole time it waits, which means every press
during a slow device write still reaches it - letters into its live
filter, Esc resolving a round nobody is waiting for yet, handed back
the instant the work lands.
BusyDialog is BusyScreen drawn as a box over what it interrupts:
modal, so the press dies on the card instead. Nesting keeps the
outermost one, so a batch of writes is one wait rather than a box per
write, and its caption can change to say which step it is on.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 5
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