fix: adapt selector layout after terminal resize

[jdx]

Summary

• retain each selector's previous rendered frame instead of only its original physical height
• recalculate that frame's wrapped height using the terminal's current width before clearing it
• refresh page capacity from the current terminal height on every redraw
• clamp pages, cursors, and list scroll positions when the resized viewport no longer contains them
• add focused capacity and navigation-clamping tests for Select and MultiSelect

Root cause

The wrapped-row fix in #192 recorded how many physical rows a frame occupied when it was drawn. After a terminal resize, that number could become stale because the terminal reflows the same text at a different width. Selector capacity was also calculated only at construction, so pagination continued using the original terminal height.

Behavior

Select, MultiSelect, and List now retain the previous frame text. On the next redraw after a resize, they measure that old frame at the new width, erase the reflowed footprint, recalculate capacity from the new height, clamp navigation state, and render the corrected layout.

This intentionally updates on the next input/redraw. Immediate idle redraw would require a resize-aware input event API; console::Term::read_key currently blocks on key input and does not expose resize events.

The branch is rebased onto the merged #193, so resize correction is enclosed in the synchronized-output update: geometry is recalculated correctly and the clear/redraw transition is presented atomically.

Validation

• cargo fmt --check
• cargo test --lib --tests (45 unit tests and 16 integration tests passed)
• cargo clippy --all-targets -- -D warnings

This PR was generated by an AI coding assistant.

---

Note

Medium Risk
Unix-only low-level TTY/signal/select code affects all three interactive prompts; non-Unix still uses blocking read_key only, but incorrect raw-mode or signal handling could break input or leave the terminal in a bad state.

Overview
Terminal resize handling for Select, MultiSelect, and List on Unix: prompts now react when the window changes size, not only on the next keypress.

Adds EventReader (src/event.rs) that multiplexes keyboard input with SIGWINCH via select, raw TTY mode, and a signal-hook pipe. Resize events surface as read_key returning None, which triggers a full-screen clear and redraw on the next loop.

Layout and erase fixes: widgets keep the previous frame text (last_frame) instead of a fixed row count. Before clearing, wrapped height is recomputed at the current terminal width; each redraw calls refresh_layout to derive page capacity from terminal height and clamp page, cursor, and list scroll so the focused / first-visible item stays stable. Select paging now counts filtered options.

Tests: unit tests for resize_layout, plus a PTY integration test (tests/resize.rs) asserting an idle prompt emits a second synchronized frame after resize without keyboard input. libc (unix) and portable-pty (dev) dependencies added.

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between a5facf0 and 1f712ca.

📒 Files selected for processing (7)

• Cargo.toml
• src/event.rs
• src/lib.rs
• src/list.rs
• src/multiselect.rs
• src/select.rs
• tests/resize.rs

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[greptile-apps]

Greptile Summary

The PR makes selector layouts resize-aware.

• Preserves the absolute focused option or visible list offset when terminal capacity changes.
• Recalculates frame geometry and page capacity before redraw.
• Adds Unix resize-event handling and focused resize regression tests.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the previously reported selector focus and list-offset resize issues are corrected by preserving their absolute positions before recalculating pagination.

Important Files Changed

Filename	Overview
src/event.rs	Adds Unix SIGWINCH and terminal-input multiplexing so active prompts redraw immediately after resize.
src/select.rs	Preserves the selected option’s absolute filtered index while remapping pagination to the resized capacity.
src/multiselect.rs	Preserves the focused option across capacity changes and redraws from retained frame content.
src/list.rs	Preserves the first visible entry by converting the old combined offset into the resized page and scroll state.
tests/resize.rs	Adds PTY coverage demonstrating that a resize triggers another synchronized redraw.
Cargo.toml	Adds the Unix-only libc dependency required by terminal event handling.

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