Module scroll 

Scroll-offset clamping for the messages panel.

The chat Paragraph is rendered without Wrap, so ratatui draws exactly one terminal row per Line. Total height is therefore just lines.len() — no per-line width arithmetic required.

Constants

SCROLL_BOTTOM

Sentinel meaning “follow latest content” (auto-scroll).

Functions

clamp_scroll

Clamp scroll offset so the visible slice of lines stays within messages_rect and honor the SCROLL_BOTTOM follow-tail sentinel.

reset_height_memo

No-op retained for API compatibility with an earlier memo-based revision of the scroll-height calculator.