TUI: Page up/down scrolls half a page ("half page" scrolls a quarter) — intended or doc error?

Description

Description

The page-scroll commands scroll half of what their names and keybind descriptions say:

• Behavior: packages/tui/src/routes/session/index.tsx:758,768,798,808 — scroll.scrollBy(±scroll.height / 2) and / 4
• Descriptions: packages/tui/src/config/keybind.ts:135-140

Since pageup/pagedown are bound by default to session.page.up/session.page.down, every PageUp press moves half a screen — noticeably less than editors, pagers, and other TUIs.

Git history doesn't reveal intent either way: the amounts come from the TUI migration commit 96bdeb3 ("OpenTUI is here", Oct 2025) with no comment, and the "one page" / "half page" descriptions were added months later in a0fc27e (May 2026), so the two sides were never aligned.

Question for maintainers: is the halving intentional (e.g. to keep reading context, like tmux copy mode)? Then the keybind descriptions should be fixed to say "half page" / "quarter page". If not, I'm happy to send a PR making PageUp/Down scroll a full viewport and the half-page commands scroll half.

Plugins

none

OpenCode version

1.18.21 (also verified the behavior on 1.17.9)

Steps to reproduce

1. Open a session with more than one screen of messages
2. Press PageUp → content scrolls up only half a screen
3. Press Ctrl+Alt+U ("half page up") → scrolls only a quarter of a screen

Operating System

Windows 11

Terminal

Windows Terminal