Classic TUI renderer scrolls to bottom on focus regain (no setting to disable)

Summary

When using Claude Code's classic (default) terminal renderer, scrolling
up to read earlier output and then clicking away from and back to the
terminal window snaps the view back to the bottom of the output. The
user has to scroll up again to find their place. This makes it hard to
reference earlier context while working in another window.

Steps to reproduce

1. Run claude in a terminal (classic / default TUI mode).
2. After Claude has produced enough output to fill more than one

screenful, scroll up using the terminal scrollback so earlier output
is visible.

1. Click on another window to move focus away from the terminal.
2. Click back on the terminal.

Expected

Scroll position is preserved — the view stays where the user left it.

Actual

The view jumps to the bottom of the output. The user must scroll back
up to where they were reading.

Workaround attempted

Setting "autoScrollEnabled": false in ~/.claude/settings.json had
no effect. Per the schema description ("Auto-scroll the conversation
view to bottom (fullscreen mode only)"), that setting only applies to
the fullscreen renderer. There appears to be no equivalent setting for
the classic renderer.

Environment

• Claude Code version: 2.1.138
• OS: Debian GNU/Linux 12 (bookworm)
• Terminal emulator: xfce4-terminal
• TERM: xterm-256color, COLORTERM: truecolor
• TUI mode: classic / default (not fullscreen)

Note

The behaviour does not occur with other CLI applications in the same
terminal emulator, so it appears to originate in Claude Code's classic
renderer rather than the terminal.

Suggested fix

Either honour autoScrollEnabled: false in the classic renderer too,
or add a separate setting (e.g. preserveScrollOnFocus) so users on
the classic renderer have a way to opt out of the snap-to-bottom.