Maintainer-reported (handoff): after spawning a sub-agent in YOLO, the
transcript renders solid black and scroll keys go dead, but footer +
sidebar still render fine. The shape (black + dead input together)
strongly suggests a `View` is on the stack that returns empty layout
AND intercepts key events at the top level. The fix wants a tighter
repro than we have today.
Add `tracing::debug!` to every push / push_boxed / pop on `ViewStack`
and to the implicit pops in `apply_action` (Close + EmitAndClose).
Each line carries the `ModalKind` and post-action depth, so a future
`RUST_LOG=deepseek_tui::view_stack=debug` capture will show exactly
which view stayed pushed when the symptom recurred.
No behavior change. The handoff explicitly suggested this as the
first-look diagnostic step; we ship the diagnostic now so the next
report comes with evidence.
Refs the unresolved sub-agent black-transcript symptom captured in
session-3 handoff. Will surface to a tracking issue once we have a
concrete repro from the maintainer.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Hunter Bown
cba5e829fc