Operator: "Why does the thinking scroll a little section at the
bottom of the thinking pane instead of scrolling the whole pane?"
Root cause: v0.6.1's thinking-current Static was docked to the
bottom of the Thinking pane and rendered the last 200 chars of
streaming content. As deltas arrived, the displayed 200-char tail
shifted — old text fell off the left, new text appeared on the
right — visually reading as "a little section scrolling at the
bottom" while the larger thinking-log RichLog above showed only
the previous run's closed content (or nothing on first turn).
## Fix: stream directly into thinking-log
The Static is gone. Thinking deltas now write straight to the
`thinking-log` RichLog (one delta = one line in the scrollable
log). The whole pane scrolls naturally as content arrives —
operator can switch to Ctrl+3 and see streaming content fill
the pane top-to-bottom.
Routing pattern:
First Thinking delta of run:
→ write Rule(title="turn N · thinking #K start") to thinking_log
→ write delta content as a line
→ set thinking_open = True
Subsequent Thinking deltas:
→ write delta content as a line
Non-thinking event (closes the run):
→ write Rule(title="turn N · thinking #K end") to thinking_log
→ reset thinking_open
The Rule(start) at the top of an in-progress run is now the
"thinking is happening" indicator. No more separate live-preview
widget required.
## Trade-off: no markdown re-render
Pre-v0.6.5 closed runs got a Markdown(full_content) render between
the start/end Rules. v0.6.5 drops that — the streamed deltas ARE
the content; re-rendering as Markdown would either need to wait
for run-end (no streaming) OR re-render incrementally per delta
(bad UX). Streaming wins for "live observability" framing.
The downside: if model thinking has Markdown structure (lists,
code), it renders as raw text. Acceptable per operator's "stream
in line" framing.
## Removed widgets
- `Static#thinking-current` (right column / Thinking pane bottom)
- `TuiPresenterState.render` no longer takes a `thinking_widget` param
- `TuiPresenterState.thinking_buffer` field dropped (no accumulation)
- `_stream_turn_worker` no longer queries `#thinking-current`
- `on_mount` no longer hides `#thinking-current`
- DEFAULT_CSS `#thinking-current` block removed
## Contract amendment
INV-022 amended: thinking now streams as raw delta lines, not
Markdown-rendered on close. INV-024 amended: thinking-current
Static removed entirely (was relocated v0.6.1, removed v0.6.5).
Drift-check clean.
## Tests
238/238 GREEN (was 241 — 3 obsolete widget tests deleted:
test_thinking_widget_truncation, test_thinking_widget_visibility_lifecycle,
test_terminal_events_belt_and_braces_widget_cleanup). 5 routing tests
rewritten for the new streaming shape (test_thinking_streams_into_thinking_log,
test_thinking_closes_to_thinking_log, test_multiple_thinking_runs_...,
test_render_exception_fallback, test_cancelled_mid_thinking_closes,
test_left_column_content_only).
ruff clean. Manual injection test confirms routing: Rule(start) +
delta lines write to thinking_log; transcript untouched.
Patch bump (v0.6.4 → v0.6.5) — internal restructure within Thinking
pane; presenter signature narrowed; no caller-visible public API
change (RatatoskrApp + AgentPickerApp surfaces identical).
vh
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