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## What Fix PageUp/PageDown behaviour in the Ctrl+T transcript overlay so that paging is continuous and reversible, and add tests to lock in the expected behaviour. ## Why Today, paging in the transcript overlay uses the raw viewport height instead of the effective content height after layout. Because the overlay reserves some rows for chrome (header/footer), this can cause: - PageDown to skip transcript lines between pages. - PageUp/PageDown not to “round-trip” cleanly (PageDown then PageUp does not always return to the same set of visible lines). This shows up when inspecting longer transcripts via Ctrl+T; see #7356 for context. ## How - Add a dedicated `PagerView::page_step` helper that computes the page size from the last rendered content height and falls back to `content_area(viewport_area).height` when that is not yet available. - Use `page_step(...)` for both PageUp and PageDown (including SPACE) so the scroll step always matches the actual content area height, not the full viewport height. - Add a focused test `transcript_overlay_paging_is_continuous_and_round_trips` that: - Renders a synthetic transcript with numbered `line-NN` rows. - Asserts that successive PageDown operations show continuous line numbers (no gaps). - Asserts that PageDown+PageUp and PageUp+PageDown round-trip correctly from non-edge offsets. The change is limited to `codex-rs/tui/src/pager_overlay.rs` and only affects the transcript overlay paging semantics. ## Related issue - #7356 ## Testing On Windows 11, using PowerShell 7 in the repo root: ```powershell cargo test cargo clippy --tests cargo fmt -- --config imports_granularity=Item ``` - All tests passed. - `cargo clippy --tests` reported some pre-existing warnings that are unrelated to this change; no new lints were introduced in the modified code. --------- Signed-off-by: muyuanjin <24222808+muyuanjin@users.noreply.github.com> Co-authored-by: Eric Traut <etraut@openai.com>