fix(tui): flush OSC 52 clipboard write, propagate errors on fallback

[maorizenberg]

Issue for this PR

Fixes #4283

Type of change

• Bug fix

What does this PR do?

Copy-to-clipboard on Linux Wayland (e.g., Ubuntu 24.04) showed "Copied to clipboard" toast but paste returned old content. Two bugs:

1. OSC 52 escape sequence used process.stdout.write() which buffers/interleaves with TUI rendering — terminal never processes sequence. Changed to fs.writeSync(process.stdout.fd, ...) for immediate flush to TTY fd.

2. All clipboard write paths silently caught errors with .catch(() => undefined), swallowing failures when no clipboard tool (wl-copy, xclip) available. Removed catch — errors now propagate to caller which shows error toast.

Also added -i flag to xclip command for explicit stdin read.

How did you verify your code works?

Tested on Ubuntu 24.04 Wayland without wl-clipboard installed. Copy now works via OSC 52. All 192 existing tests pass. Typecheck clean across all 36 packages.

Screenshots / recordings

N/A (terminal fix, no UI change)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Related PRs Found:

1. PR fix(tui): prevent false clipboard copy success on Linux #31252 - fix(tui): prevent false clipboard copy success on Linux

   • Related: Addresses false success toasts for clipboard operations on Linux, which is the core issue being fixed in PR fix(tui): flush OSC 52 clipboard write, propagate errors on fallback #35289

2. PR fix(clipboard): write OSC52 to /dev/tty instead of stdout #12129 - fix(clipboard): write OSC52 to /dev/tty instead of stdout

   • Related: Directly addresses the same OSC 52 buffering issue with an alternative approach (writing to /dev/tty)

3. PR fix(cli): Linux clipboard selection #32370 - fix(cli): Linux clipboard selection

   • Related: Linux clipboard functionality improvements

4. PR fix: enable primary clipboard copy for Wayland/X11 to fix Linux middle-click paste #6370 - fix: enable primary clipboard copy for Wayland/X11 to fix Linux middle-click paste

   • Related: Addresses Wayland clipboard issues

Most relevant: PR #12129 appears to be the closest match—it also fixes the OSC 52 stdout buffering issue on Linux, though it uses /dev/tty instead of the fs.writeSync(process.stdout.fd, ...) approach in PR #35289.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[github-actions]

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