Bug: Pressing Cmd+C to copy selected text resets the scroll position to the bottom on macOS

[zyunlongz]

What version of Codex CLI is running?

codex-cli 0.145.0

What subscription do you have?

Plus

Which model were you using?

gpt-5.6-sol

What platform is your computer?

macOS

What terminal emulator and version are you using (if applicable)?

iTerm2, Ghostty

Codex doctor report

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What issue are you seeing?

When viewing previous output in Codex CLI, selecting text and pressing Cmd+C to copy causes the terminal view to immediately jump back to the bottom of the session.

This makes it difficult to inspect or copy older output because the current scroll position is lost every time the keyboard shortcut is used.

What steps can reproduce the bug?

1. Start Codex CLI.
2. Generate enough output so that scrolling is possible.
3. Scroll up to previous output.
4. Select any text.
5. Press Cmd+C to copy the selected text.

What is the expected behavior?

The selected text is copied to the clipboard while preserving the current scroll position.

Additional information

• Reproduces in Ghostty 1.3.1.
• Reproduces in iTerm2.
• Using Edit → Copy from the macOS menu does not trigger the issue.
• The issue only occurs when using the Cmd+C keyboard shortcut.
• The same workflow in Claude Code does not exhibit this behavior in either Ghostty or iTerm2.
• Running Codex with --no-alt-screen does not resolve the issue.

[github-actions]

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

• [Windows][TUI] PageUp/PageDown in the main transcript can snap scrollback to the bottom #34716

Powered by Codex Action

[zyunlongz]

I looked into this and have a fix. (I can't open a PR — this repo restricts PR creation to collaborators — so the patch is on a fork branch linked below for a maintainer to pick up.)

Root cause

The TUI enables the Kitty keyboard protocol with REPORT_EVENT_TYPES (in codex-rs/tui/src/tui/keyboard_modes.rs), which makes terminals report key release events. On macOS, iTerm2 and Ghostty consume the Cmd+C press for their local "copy" binding, but with release reporting on they still forward the key release of c to the app. That stray forwarded keystroke triggers the terminals' scroll-to-bottom-on-keystroke behavior, so copying while scrolled up jumps the view to the bottom.

I verified this with a probe replicating Codex's exact terminal setup:

• Flags 19 (DISAMBIGUATE_ESCAPE_CODES | REPORT_EVENT_TYPES | REPORT_ALTERNATE_KEYS): Cmd+C forwards \x1b[99;1:3u — key c, event type 3 = release.
• Flags 17 (same, minus REPORT_EVENT_TYPES): Cmd+C forwards nothing.

This matches the two clues in the report:

• Edit → Copy (menu) is unaffected — the menu path sends no keystroke.
• Claude Code is unaffected — it does not enable release reporting.

Fix

Drop REPORT_EVENT_TYPES. Codex only ever acts on Press/Repeat and explicitly discards releases everywhere (is_press requires Press|Repeat; ~15 handlers early-return on Release), and auto-repeat still arrives as repeated Press events without the flag — so release reporting provides no functional benefit. DISAMBIGUATE_ESCAPE_CODES (required for the Shift+Enter listener, the reason these flags were added in #1743) and REPORT_ALTERNATE_KEYS are kept.

fn codex_keyboard_enhancement_flags() -> KeyboardEnhancementFlags {
    KeyboardEnhancementFlags::DISAMBIGUATE_ESCAPE_CODES
        | KeyboardEnhancementFlags::REPORT_ALTERNATE_KEYS
}

Verified on macOS in iTerm2 and Ghostty: Cmd+C while scrolled up no longer jumps to the bottom, and Shift+Enter still inserts a newline. Added a regression test (keyboard_enhancement_flags_exclude_release_reporting).

Branch / diff (ready to cherry-pick): zyunlongz@a6ed33e

For anyone hitting this now, a workaround is to disable the terminal's scroll-on-keystroke (Ghostty: scroll-to-bottom = no-keystroke; iTerm2: Advanced settings), or run with CODEX_TUI_DISABLE_KEYBOARD_ENHANCEMENT=1 (this also disables Shift+Enter).